Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8ad5efc8ba2fdc…

MALICIOUS

PDF

37.7 KB Created: 2020-07-31 23:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28f050301c02113a2ad33de19a018695 SHA-1: 7b916f9d3551f3f68d896742a3b5d2e64149e196 SHA-256: 6e8ad5efc8ba2fdcec0ccbe49ee0d00041c040acb078a3b8435ea72d7d1575d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=john+deere+la110', is identified as a malicious redirector. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to harmful content.

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=john+deere+la110
    • http://files.evieojjehfitness.com/uploads/1/3/1/8/131871814/0d46b351.pdf
    • http://files.bakesandco.com/uploads/1/3/1/4/131406288/6119131.pdf
    • http://files.tracepickering.com/uploads/1/3/1/4/131482864/sujopavoropetokil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/88293955038.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/visigevibimo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8845/2515/files/16265410780.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/edit_pdf_text_in_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/21082934365.pdf
    • https://cdn.shopify.com/s/files/1/0429/2660/4447/files/nigodukogoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/90994202996.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/pokemon_colosseum_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0440/6027/8936/files/vinulagifupupokagudunore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/2841320804.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054c8.bin
5be1f0b40f450039d9b165680e57cf5602dfb62f44295108a39d324768fee1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x54C8 4916 bytes
font_01_sfnt_off00006573.bin
37df9257e0e1d6fc2229c27c8cc79a24fea23269f363bb01f17fc918e2cb69e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6573 10864 bytes