Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8e2ad41ab8d5c6…

MALICIOUS

PDF

37.9 KB Created: 2020-07-08 12:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: b326a3b6d2b11c4c8b050e1520d45804 SHA-1: 1bbc2a5ad7e0e9ae526fdded0382b53d945b0d8a SHA-256: 1e8e2ad41ab8d5c680b618eee31d5cb0290212161116c186ff8ab144391283a6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains numerous embedded links, many of which point to external websites that host more PDF files. One critical heuristic identified a link to a known malicious redirector infrastructure at `ttraff.ru`. The document body text, though partially corrupted, includes keywords related to PDF conversion, suggesting a lure to trick users into visiting these malicious sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/wb?keyword=convert%20pdf%20to%20word%20using%20ocr%20online%20free In PDF document text
    • http://files.ruthiejenkins.com/uploads/1/3/0/8/130874645/4844631.pdfIn PDF document text
    • http://files.columbiadentcenter.com/uploads/1/3/0/9/130969910/jubegonakajij-desagomabof-sateno-pikilolot.pdfIn PDF document text
    • http://files.semperparatuspelli.com/uploads/1/3/1/8/131871648/zitopex.pdfIn PDF document text
    • http://files.elkfordearlyyears.com/uploads/1/3/0/7/130739769/8598998.pdfIn PDF document text
    • http://files.natural--living.com/uploads/1/3/1/4/131409055/9334523.pdfIn PDF document text
    • http://files.theboisterousbabe.com/uploads/1/3/1/4/131407665/xisufe_kelekixat_zosatelu.pdfIn PDF document text
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdfIn PDF document text
    • http://files.inspiretogather.com/uploads/1/3/2/6/132695574/6667265.pdfIn PDF document text
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdfIn PDF document text
    • http://files.oregonflightschool.com/uploads/1/3/0/7/130776567/lipapowukozav.pdfIn PDF document text
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://punedetobipo.files.wordpress.com/2020/07/lijipafopurujos.pdfIn PDF document text
    • https://segugodupeg.files.wordpress.com/2020/07/45207249366.pdfIn PDF document text
    • https://jilanuduk.files.wordpress.com/2020/06/70628379355.pdfIn PDF document text
    • https://xogabasijipu.files.wordpress.com/2020/06/78753493110.pdfIn PDF document text
    • https://foxokiriku.files.wordpress.com/2020/06/54082495515.pdfIn PDF document text
    • https://mixanutiliba590569985.files.wordpress.com/2020/06/zidajevijofopowoxikumer.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_off000056dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56DC 5168 bytes
SHA-256: d8d557995c63d2a9e3c6a1a82e6f0c30124bfd9aa4366ca12d3e825d50c06992
font_01_sfnt_off000068a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A0 10088 bytes
SHA-256: 25ab197666ea02ec378952e5bf05b2aa4c71b8762b6f677463ec88fe0e4655d9

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