Malicious PDF — malware analysis report

Static analysis result for SHA-256 9585dfbcc13191a2…

MALICIOUS

PDF

40.3 KB Created: 2020-07-10 22:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 9d1385454e73d879cdada5c016f5ab1a SHA-1: 076ee6fa439ed9d9dedc1c65888ba452e71090ae SHA-256: 9585dfbcc13191a282ac9996da8f7dbb74ce09339ab3d0030aa7ce52230c662d
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, identified as a link farm, and one critical link to a known malicious redirector. The document body, though partially corrupted, contains text suggesting it is intended to be revision notes, a common lure for phishing or malware delivery. The presence of a call-to-action button further supports a malicious intent to trick the user into clicking the embedded links.

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.ru/pify?keyword=cie+igcse+biology+revision+notes+pdf In PDF document text
    • http://files.hathawayfarms.com/uploads/1/3/1/4/131437319/rememimeki-zokekegiwutix.pdfIn PDF document text
    • http://files.lambdasigmaphi.org/uploads/1/3/0/8/130814342/rutaromazuses-wolewafes.pdfIn PDF document text
    • http://files.josepblas.com/uploads/1/3/1/4/131437268/kiwinorubidosa.pdfIn PDF document text
    • http://files.fabricationshq.com/uploads/1/3/0/8/130813992/tatakabexatebab-wopojivef.pdfIn PDF document text
    • http://files.canadagripsport.com/uploads/1/3/0/7/130775268/dobalebow.pdfIn PDF document text
    • http://files.bravotouch1.com/uploads/1/3/1/6/131606688/5238999.pdfIn PDF document text
    • http://files.vividskateshop.com/uploads/1/3/0/7/130776852/4613940.pdfIn PDF document text
    • http://files.rantofaretailer.com/uploads/1/3/2/3/132302998/af4c8da2dcc.pdfIn PDF document text
    • http://files.portageyouthswimteam.com/uploads/1/3/1/4/131453943/laratu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tojesud.files.wordpress.com/2020/06/2689505517.pdfIn PDF document text
    • https://pekakupesile.files.wordpress.com/2020/06/geven.pdfIn PDF document text
    • https://porafofaj.files.wordpress.com/2020/06/xadabuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/86913665263.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/nesukader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41877136991.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_off0000586a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x586A 5224 bytes
SHA-256: 9cff017e283a3ac41050526e552ede2e7ed1294b3ed3f10f53748c2552e141aa
font_01_sfnt_off00006a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3F 13468 bytes
SHA-256: e9c2ffc662f717429d5dce64df006d12d76e307d5bc5b15d9a3c63e4a7d71cb9

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