Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5cf3bb64a15602…

MALICIOUS

PDF

55.3 KB Created: 2020-08-14 23:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8800f79e17febc99097dae114b2d154 SHA-1: db61fe1735e95a2ae9e7505da425b309d4fe1e60 SHA-256: cf5cf3bb64a156027c78fc231013726d288c8f8f7c2ba414c63224c034a99845
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a guide for 'Dragon Age Inquisition'. It also hosts a large number of other PDFs on Shopify, likely as 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.cc/pify?keyword=dragon+age+inquisition+vivienne+romance+guide
    • http://files.plutorules.com/uploads/1/3/1/6/131606069/3187111.pdf
    • http://files.zgas.org/uploads/1/3/1/3/131378779/59ee66.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/jatazugidanajubiledipas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/27548303207.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/14998282967.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/4354079579.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/biology_notes_for_class_12_chapter_wise_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/bokobasu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.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/
    • https://cdn.shopify.com/s/files/1/0428/3482/12

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d28.bin
e2072a8827fe0a63854c239f8b21a529a80c38dddebf705fcf6dae6e491537d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D28 5412 bytes
font_01_sfnt_off00008f71.bin
3e7890a4384d74ac1d22f906d3b14745244d5cba6e9da02ef521f0bb68ed1b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F71 10772 bytes
font_02_sfnt_off0000b469.bin
321bc31940a68fffda9e5332938f2019069edcd7fefc88e2158034b1523661bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 17952 bytes

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