Malicious PDF — malware analysis report

Static analysis result for SHA-256 668aacd88df07277…

MALICIOUS

PDF

40.3 KB Created: 2020-08-18 15:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b68e80160d40c5f80ffcc04a36ebd9da SHA-1: 54c18633aa3f3ad18f0ae6a859aadf8001a8223e SHA-256: 668aacd88df0727705e0a3e24d7f07a74bccd669ce4bbf401cafca6b128818c1
154 Risk Score

Malware Insights

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

The PDF document contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the malicious URL and references to free course material, suggesting a lure to entice users to click. The ML classifier strongly flagged this PDF as malicious.

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=design+patterns+in+javascript+udemy+free
    • http://files.thebeveragebutler.com/uploads/1/3/2/7/132740997/tigarukoveb-faxamubit-burugapeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/3907085178.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/cbt_for_anxiety_disorders_a_practitioner_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/optical_isomerism_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/almagestum_novum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/ergonomic_chair_design_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/carbimazole_mechanism_of_action.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/zokuvezawonulafomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/xifegarimusudilere.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/31688241993.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_off00005e8f.bin
f5f49371aab00b9b69716e451521cc7aa99462239efc338136ed2b28ac8237ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8F 5680 bytes
font_01_sfnt_off000071dc.bin
c255f379eb0258ebbf02f07ee21b744790e1d513847fea6a50b0836938a2fe31
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 10120 bytes