Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa4fc2ec2780294…

MALICIOUS

PDF

43.7 KB Created: 2020-11-02 23:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f965b4e660168fa7dc69313444a5ba SHA-1: d78b686bfe0b4cddd2b6c3435b36c80399af6e2a SHA-256: dfa4fc2ec2780294f779cc34b98d0481340631188380a8db3cebddc989dbdb91
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy, likely intended to drive traffic to malicious sites. 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.club/123?keyword=valence+electron+worksheet+answer+key
    • https://fofosaja.weebly.com/uploads/1/3/4/2/134234592/vewajodupuropobi.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f91f776daede.pdf
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/bimakefo_xolulezeradi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0502/2675/7786/files/witozuj.pdf
    • https://uploads.strikinglycdn.com/files/2635784e-2da4-4123-adbf-4fe75129c756/fedavajov.pdf
    • https://uploads.strikinglycdn.com/files/f1e792f3-34c8-4f46-8ee4-a21e79b5b83a/xabubu.pdf
    • https://uploads.strikinglycdn.com/files/afd9733a-b580-4b7d-8e22-163002754338/wabokadisekibesome.pdf
    • https://uploads.strikinglycdn.com/files/e855faec-9541-4bb8-b384-f9f612d1450e/tazutedufesukizexesawub.pdf
    • https://uploads.strikinglycdn.com/files/47d4375d-0d64-476e-afa3-cf35a601a071/final_fantasy_6_strategy_guide.pdf
    • https://uploads.strikinglycdn.com/files/34c64d8e-e55c-48e6-8a80-740a36295e09/sunas.pdf
    • https://uploads.strikinglycdn.com/files/7e67f36e-fa7e-4c14-a08a-73618dbe99cd/berepabovulinivuvelaloxe.pdf
    • https://uploads.strikinglycdn.com/files/c587ad55-6f10-4cf5-a301-eeb61e19400e/69832961542.pdf
    • https://uploads.strikinglycdn.com/files/b1899730-d09a-4d54-a427-239cc9cd23c7/famodo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604d.bin
eeba88ca1f09a4e73a2fa85b9bea30c28c91eb2039d0fb371bc20474ed235a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 4852 bytes
font_01_sfnt_off000070d5.bin
cf6376254e3e11fff6ab05588b0e526f7ff391356da7604bfefb3dcdd5d824df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D5 10104 bytes
font_02_sfnt_off0000937c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937C 4324 bytes

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