Malicious PDF — malware analysis report

Static analysis result for SHA-256 818755598806d954…

MALICIOUS

PDF

43.3 KB Created: 2020-09-02 22:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4721b5367ec7e99dd6ec72740f84eed SHA-1: b19835da9e697f271c383f98d25e13fe6f3d3aab SHA-256: 818755598806d954fe10136d1467991cf8a39dcffb870a1fe35832c352ea5405
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically targeting a search query related to 'automatic repair windows 10'. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content.

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.com/wix?keyword=automatic+repair+windows+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5448/8990/files/anna_madrigal_anagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/30410793544.pdf
    • https://cdn.shopify.com/s/files/1/0449/0782/3259/files/practical_creative_writing_exercises.pdf
    • https://static.usrfiles.com/ugd/26481d_fb0756dcdfe4492595d31e2f8c1ddce7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f4facdf0aea4479bc4ce678d697843d.pdf
    • https://static.usrfiles.com/ugd/9757e7_695c59f20bf44419a6cb38ff737fa8db.pdf
    • https://cdn.shopify.com/s/files/1/0434/4794/3330/files/matizekinariwuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/7248057252.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/zedinupifoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/50493213935.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/electrocardiograma_anormal_interpretacion.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2341/files/98563715514.pdf
    • https://cdn.shopify.com/s/files/1/0428/4429/1228/files/a_week_in_winter.pdf
    • https://cdn.shopify.com/s/files/1/0450/5364/0856/files/state_of_decay_breakdown.pdf
    • https://cdn.shopify.com/s/files/1/0434/6662/1094/files/77794345451.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_off00006c49.bin
9065a01a2b99ba9b001ffc3925dc7bc851462b0a282f536a56809512a6be2297
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 5464 bytes
font_01_sfnt_off00007ed6.bin
fcd4832383b56d315387c1814a28f2472561f3fd58e490d3a51a3d1368421eea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED6 9932 bytes