Malicious PDF — malware analysis report

Static analysis result for SHA-256 669a67d13b80d972…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 00:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b63a1e4bb8f5f3137b728311f0c5a9 SHA-1: d2fcd70ef74467843303b776d7b301528b24292d SHA-256: 669a67d13b80d972ed4ae0e781b0ebb972707a8b780d53127d4f4a8583117fd3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and contains a large number of embedded links, many of which point to external PDF files. One of the primary links, https://ttraff.ru/wb?keyword=vw%20jetta%202012%20manual, is identified as a malicious redirector. The document's structure suggests it is part of a link farm designed to manipulate search engine results or distribute malicious 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/wb?keyword=vw%20jetta%202012%20manual
    • http://files.littlecakepot.com/uploads/1/3/0/8/130814718/924605.pdf
    • http://panakavog.massageformommies.com/uploads/1/3/2/7/132740214/4213550.pdf
    • http://files.mishpuchacamping.org/uploads/1/3/0/7/130776661/zifotavasen.pdf
    • http://files.unitedchurchannapolisroyal.com/uploads/1/3/1/4/131407565/gixanalovonaf_jivuge_topalirawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5974/7745/files/tarozijupejowojowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9991/files/65945123930.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/63075656415.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/figemefaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/84591385459.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/44908761142.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/47724225429.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/gotavuxezulixogojotomej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/podufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8940/3810/files/85065914226.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.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_off00006237.bin
53f33a579399d8daa483b04a960f616026e9c1c7995205c0e31e3507a26d1630
pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 5016 bytes
font_01_sfnt_off00007350.bin
5748e24f7af98b0b27492c4355a4e0ad75ce6f1041d41f8c4977c939d78dfad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 10220 bytes