Malicious PDF — malware analysis report

Static analysis result for SHA-256 6261b08f18662ae3…

MALICIOUS

PDF

37.4 KB Created: 2020-08-30 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61917389e2326b3a32ae24ab502cb4b3 SHA-1: df07215a0d8ea3d16e91c37c0d39064abfe2676c SHA-256: 6261b08f18662ae3361c20442ddba91f6f11e7affa344799351709f03dfd4338
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for "food and culture 6th edition pdf". The document also contains a large number of links to other PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

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/wix?keyword=food+and+culture+6th+edition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/wufelodilepuwejatuxokin.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/vizuzemavupanulijagebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/asakuki_diffuser_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2001/0140/files/73023542360.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/8109720926.pdf
    • https://cdn.shopify.com/s/files/1/0444/4828/4839/files/change_file_size_free.pdf
    • https://static.usrfiles.com/ugd/49be48_4e889e81fb534d7b888da24b3b43c0aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_d190ac8a165c4305b7c059bd4fd504f8.pdf
    • https://static.usrfiles.com/ugd/b58d21_2a20ec56771c4c9daa2b5557785ef830.pdf
    • https://static.usrfiles.com/ugd/b8c837_78b162e72da3437086b193559b6a6bf9.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/effortless_mastery_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/denunogutuxezusarudepiz.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_off00005524.bin
00348fc138ed163d2f8e72018c1853d42f61a3c74098b31155f67288ed83abf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5524 5172 bytes
font_01_sfnt_off000066bb.bin
7748c4396b0b765ddf0423d222b84d0f0cb61ea97d71ab3af45d05c7c28817a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x66BB 10016 bytes