Malicious PDF — malware analysis report

Static analysis result for SHA-256 089ef4b820f83765…

MALICIOUS

PDF

44.2 KB Created: 2020-07-11 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd59b0efef3c77ea2f021e4766165ca0 SHA-1: fcf70fa5a38e979de9449c7c8d94358ace1857c9 SHA-256: 089ef4b820f8376567e35210738e99323322402bdb03a30b7329ead890574fe2
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.cc/wb?keyword=maturana%20varela%20autopoiesis%20and%20cognition%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, indicating it's the primary lure. The presence of numerous PDF links and a malicious redirector suggests an attempt to drive traffic to malicious infrastructure, likely for phishing or malware delivery.

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.cc/wb?keyword=maturana%20varela%20autopoiesis%20and%20cognition%20pdf
    • http://files.waveloopart.com/uploads/1/3/2/7/132740343/883d0.pdf
    • http://files.chilternyouthfootballleague.co.uk/uploads/1/3/0/9/130969809/samafag_bumojugasizirap_robif.pdf
    • http://files.penguinlandadventures.com/uploads/1/3/1/0/131070045/lurigaxixag-mudelefeji-luzeleno-noregimovos.pdf
    • http://files.shanitclark.com/uploads/1/3/0/7/130738806/jexexile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/16478280432.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/97636390515.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/31740552424.pdf
    • https://supuxobamib.files.wordpress.com/2020/06/65871863603.pdf
    • https://gesulejowav.files.wordpress.com/2020/06/lojego.pdf
    • https://dudibes.files.wordpress.com/2020/07/3995964015.pdf
    • https://guzolegevaxa.files.wordpress.com/2020/07/88645015165.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31178329868.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/62615607961.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/51143671143.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/libutufisolefod.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/18902122043.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66491839223.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.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_off00006cae.bin
78d05ffcc59c1833214090eee385855d65d7e4a640a5f7e8cf6c6f3d384ff6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 5268 bytes
font_01_sfnt_off00007eb4.bin
bfe0be7b34708122e1cce6701b678c209479c9b5be351dae179091a52408e967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB4 10728 bytes

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