Malicious PDF — malware analysis report

Static analysis result for SHA-256 726406359546b00e…

MALICIOUS

PDF

57.8 KB Created: 2020-08-13 22:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef96bde101032af3ba4068d0df4c3e81 SHA-1: a2b6175c813465e5714e115a3f6dc1e79f5c46c5 SHA-256: 726406359546b00e213801af4995c683c46839509ec0d630c85b927cf2b36f63
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=film+bunraku+full+movie'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, likely to obscure the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic strongly indicate a phishing or malicious redirection attempt.

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=film+bunraku+full+movie
    • http://files.hsc3knives.com/uploads/1/3/0/9/130969243/a00465f049b.pdf
    • http://files.5avedesign.com/uploads/1/3/1/8/131856257/9758174.pdf
    • http://devama.sacredheartemmett.com/uploads/1/3/1/4/131406153/gudevejatibori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0434/9437/5576/files/candidiasis_oral_tratamiento_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/rimatavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3543/files/sangrado_por_varices_esofagicas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5800/3096/files/79289765957.pdf
    • https://cdn.shopify.com/s/files/1/0437/9551/3505/files/76193643210.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/79305004625.pdf
    • https://cdn.shopify.com/s/files/1/0429/0497/7564/files/fotozako.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/complexity_and_contradiction_in_architecture_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikidewutuxazumal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009804.bin
cbe64b33b98d0377151a3c45b89222ba44e7d3048e6f736c6630c8fe80cacca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9804 4756 bytes
font_01_sfnt_off0000a80e.bin
d514adddb8f1834d0ad93cf6bc42b0cf9068bbb212ab82ea33bba474c9aa83fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA80E 10488 bytes
font_02_sfnt_off0000cbeb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 4324 bytes

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