Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce6981371fcb3ab…

MALICIOUS

PDF

38.5 KB Created: 2020-08-25 16:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f0e6373036a086dfec12079da46cce4 SHA-1: b4ed9939b965ee75e709010c75337920e006c6b0 SHA-256: 6ce6981371fcb3ab9a047332eb47eba766cb98718aead0c4a7a2f8e40a853906
194 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 hosted on various domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=real+estate+australia+forms'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded links point to a malicious intent to redirect users to potentially harmful content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=real+estate+australia+forms
    • http://files.relaxationretreathealthbenefits.com/uploads/1/3/1/3/131397971/351669e80.pdf
    • http://files.standrewstheatrecompany.com/uploads/1/3/1/6/131606789/7400817.pdf
    • http://files.wbphoto.org/uploads/1/3/0/8/130874201/lumajapegavakaba.pdf
    • http://files.acds-clsa.com/uploads/1/3/0/9/130969580/4c52493ab.pdf
    • http://files.clearcreekwatershedcoalition.org/uploads/1/3/0/9/130968988/tupodabin_rumujed_sosupegofekuman.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/rabifiwe.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/64846012392.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/49874440345.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/50881054535.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/sintesis_de_los_lipidos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/8772033183.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/91228047034.pdf
    • https://cdn.shopify.com/s/files/1/0464/7914/7176/files/fazuvagidumaxolamuwofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/vudemamaxukodal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0431/3247/files/deep_purple_keyboard_sheet_music.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_off00005abd.bin
478d9cc0a7fd9c8f4cdfb7cde7d4c6ca6b398be00ab533b0b663322f3e4274dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABD 4920 bytes
font_01_sfnt_off00006b63.bin
530280539bcb58c2587f4821729dc86ec8d4f63e400ff1b21c9252562b673b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B63 9936 bytes

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