Malicious PDF — malware analysis report

Static analysis result for SHA-256 1729f5bc5f8f795d…

MALICIOUS

PDF

45.6 KB Created: 2020-07-30 15:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9140b38ef9140f200355c13e3926f5c SHA-1: 802dccdd803736125ad5656249f7a6464e830492 SHA-256: 1729f5bc5f8f795d123bf579929df9b9d58fd8bf65469737085ec5be8a25ca7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content from various sources. The ML classifier also flagged this PDF with high confidence, supporting its malicious nature.

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=molecular+dynamics+simulation+elementary+methods+haile+pdf
    • http://files.wonderingthrough.com/uploads/1/3/1/6/131637552/adfedacd6fdb.pdf
    • http://files.braverthanthewaves.com/uploads/1/3/1/4/131453807/5359755.pdf
    • http://files.justcoconotchanel.com/uploads/1/3/1/8/131871648/tiraxag.pdf
    • http://files.azmendinglives.com/uploads/1/3/1/3/131398487/folijepuzenixusi.pdf
    • http://files.hemlockedgerescue.com/uploads/1/3/0/7/130775871/2380287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0957/1997/files/zojepeledaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/33214098472.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/66052156736.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/14993876953.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8723/files/balibojowewugowi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/xubarakuworolujizomulebe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/52038100743.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/witinepenarokejufuvixiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/86941190225.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/20862666865.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/tijukiradefag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4892/7386/files/nimavisefekinarekuz.pdf
    • https://doi.org/10.1063/1.4823234
    • 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_off0000741c.bin
b7917b789c742ce4e988c57df0d736e048c65d15a5ef5f3e3be5eec60c57c824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741C 5384 bytes
font_01_sfnt_off00008646.bin
622657bd2e4ffaf58635044ccbaa909d50744fd7c4764f879bfe96bef4e23449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8646 10076 bytes

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