Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5a25ceca9e60ba…

MALICIOUS

PDF

53.8 KB Created: 2020-09-02 18:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25d096d94dac8bee1bd3d54987931426 SHA-1: 789d4afe0351de7858c7bd6b219da15012829bbb SHA-256: 7d5a25ceca9e60ba99d8874553e4777cb302f3e570ac3b50aa04a1b926b36745
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. The ML classifier also strongly indicated 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.me/wix?keyword=aiag+gage+r%2526+r+manual
    • https://cdn.shopify.com/s/files/1/0457/6660/7014/files/verbals_review_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3018/files/archimedes_principle_and_law_of_floatation.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6607/files/catholic_bible_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/dawiwevixedulajawafodov.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/27162408979.pdf
    • https://cdn.shopify.com/s/files/1/0440/7849/7944/files/design_thinking_skills.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/9088370881.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/57497472742.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/lujinozuv.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1776/files/soundhound_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/printing_booklet_pages_upside_down.pdf
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/54939516941.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/tagemenix.pdf
    • https://static.usrfiles.com/ugd/87a178_7f92649b771343b0802b89fabb875718.pdf
    • https://static.usrfiles.com/ugd/e4a001_e1367a4d28bd4e3cbd37f2d94cfd8974.pdf
    • https://static.usrfiles.com/ugd/18574e_2545f8e28c2449e6971f1e6b8c944767.pdf
    • https://static.usrfiles.com/ugd/10a4aa_746a43669fc043d6ada23407853c5506.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000957e.bin
dd021ee1b2023fabe12fc8b4e96adf68caafdf6aa31fb7b90680dfed465c0e4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x957E 4632 bytes
font_01_sfnt_off0000a550.bin
756cc8dba91cd7b1808c277ff8be4d96107d12a4d5719103a69cf8da419a9b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA550 10960 bytes