Malicious PDF — malware analysis report

Static analysis result for SHA-256 07176e407d2891b1…

MALICIOUS

PDF

39.9 KB Created: 2020-07-23 10:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6d553217bd94c463a4700968121265f SHA-1: a0ec95122d5680a84e10795e2c7d5ac8b85e0cfc SHA-256: 07176e407d2891b1eed9f5a7f49a8d1dd4d76ecc2c08bbb0a59ddabac4e7495d
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious, suggesting an attempt to lead the user to a harmful site. The document also exhibits characteristics of a link farm, with numerous external PDF links, many of which are hosted on Shopify. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains suspicious elements like duplicate object bodies.

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=essentials%20of%20practical%20microbiology%20apurba%20sastry%20pdf
    • http://files.mimulux.com/uploads/1/3/1/8/131872021/8e1a96fd.pdf
    • http://files.kindredliveband.com/uploads/1/3/0/9/130969241/nageduz.pdf
    • http://files.harborcabinets.com/uploads/1/3/1/6/131636941/zakodiloguwoboj.pdf
    • http://files.mountaingorillacoffeetours.com/uploads/1/3/1/4/131407918/32e2f3a9853e.pdf
    • http://files.bereanwest.com/uploads/1/3/1/3/131383604/ravem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/64519558602.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/fusoxujulixubatu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/jejiba.pdf
    • https://cdn.shopify.com/s/files/1/0432/6123/1262/files/65082722119.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/97233461172.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/40896164695.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/96099141236.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4492/files/56012432618.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/5386529881.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4742/files/muwelis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0428/8954/3836/files/nofojevisovogatawedi.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_off00005d3b.bin
bc357fd583a26f66bf18cd3f13dd34fffdbe2f7691478747f29ee4f74d846cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3B 5556 bytes
font_01_sfnt_off00007004.bin
756158969ac1f1fd7e595c27b6be3a9673d5a414a95a1f255a8fccc9d4936695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7004 10324 bytes

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