Malicious PDF — malware analysis report

Static analysis result for SHA-256 effb4c886b075791…

MALICIOUS

PDF

48.8 KB Created: 2020-08-13 01:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d66760a3a174b65c7590d58e58b7239a SHA-1: eac842fffe3436fadc3bb1ebf44b3e76ffae4f54 SHA-256: effb4c886b075791a56520858538a947a6b9e94f3fe6196f33cc123c77d3d63a
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=adobe+pdf+reader+sign+in', is flagged as a malicious redirector. The document body text, though heavily obfuscated, contains keywords related to 'Adobe pdf reader sign in', suggesting a phishing lure. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=adobe+pdf+reader+sign+in
    • http://zuxito.lynthepen.com/uploads/1/3/2/7/132710797/586444.pdf
    • http://files.mjthomasphs.com/uploads/1/3/0/9/130969887/kumafisugiwuledoxe.pdf
    • http://gajobuj.authornicoleedwards.com/uploads/1/3/1/0/131070786/bajofebenakane.pdf
    • http://nefigon.lqqkerinsider.com/uploads/1/3/0/7/130740044/juturizexiluto.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/tewuzudez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5864/files/nuvozuduwebupomovat.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/62225816723.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6503/files/73768365653.pdf
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/academic_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5212/1762/files/temizasimaxif.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/76289253238.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/nomiwebivolidamakiserav.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/85383601695.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/wareburujuzonodibim.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/3474322846.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1219/files/la_boite_a_merveille_en_franais.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/13497696756.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080ec.bin
4b82bedde91ce1976aad1784fc4bd5c5b611400fb26466f667a3735859ff25c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EC 5308 bytes
font_01_sfnt_off00009302.bin
c71332d18665efa7f89c34c0216df3354dd42b7266ade7923e85ec73f9803dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9302 10192 bytes

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