Malicious PDF — malware analysis report

Static analysis result for SHA-256 b593ec25f2ffdb10…

MALICIOUS

PDF

39.6 KB Created: 2020-07-10 20:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 0bfdee2f28e44bc82441d176c0631f98 SHA-1: 726b5050fe992286432a9fae216d2fa5f6856594 SHA-256: b593ec25f2ffdb102b09ccda648b39b715f887fc30e0a198b2dca91aa864ae5b
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects to 'ttraff.cc', a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'salary certificate sample letter'. The presence of a visual download button further supports a malicious workflow. The primary attack pattern involves tricking the user into clicking these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=salary+certificate+sample+letter+pdf In PDF document text
    • http://files.astarboards.com/uploads/1/3/1/6/131606674/xobijoxajekexa-xifagafutimu.pdfIn PDF document text
    • http://files.barrettsblog.net/uploads/1/3/1/8/131872199/naxowajozoji-deralifawufi.pdfIn PDF document text
    • http://files.tradewatercandles.com/uploads/1/3/1/3/131383255/tadigizedipar.pdfIn PDF document text
    • http://files.ctesaisd.org/uploads/1/3/1/4/131437523/giwefifudepagadas.pdfIn PDF document text
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdfIn PDF document text
    • http://files.midnightbordercollies.com/uploads/1/3/1/4/131453056/4c12467e16.pdfIn PDF document text
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdfIn PDF document text
    • http://files.mikezamojski.com/uploads/1/3/1/3/131380397/wokadugo-tonotetoje-fivunebogewiz-kiruxiwufas.pdfIn PDF document text
    • http://files.wallingfordphoto.club/uploads/1/3/1/3/131379252/medatugoji-lewupewezilo.pdfIn PDF document text
    • http://files.fourfeltiefeet.com/uploads/1/3/0/9/130969082/9023412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tamanalewoja.files.wordpress.com/2020/06/xomemeki.pdfIn PDF document text
    • https://gokisubat.files.wordpress.com/2020/07/waxoruwoxi.pdfIn PDF document text
    • https://digawuxedado.files.wordpress.com/2020/06/1288920443.pdfIn PDF document text
    • https://ralowigi.files.wordpress.com/2020/06/kegupixobovikorewipobawe.pdfIn PDF document text
    • https://serazim.files.wordpress.com/2020/06/36712372048.pdfIn PDF document text
    • https://bozomejefew.files.wordpress.com/2020/07/bijogipoza.pdfIn PDF document text
    • https://savevawat.files.wordpress.com/2020/07/dafofulepijetodavukeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50971407729.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74808095599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/83420919507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesujegixaxufusataxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/49572984763.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6087 5080 bytes
SHA-256: 03c24e48407715a275d0a365b720bbf26ee55f0a60cb338816783db70ce50842
font_01_sfnt_off000071cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CB 9140 bytes
SHA-256: 1bbe3886b1a2335ed312639afaff8040eea5e2b4d148c1af033a47bf3e10333e

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