Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a992e3d55c47b7…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 20:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed10074db65917176e8bc638d6cc1c36 SHA-1: fb67d80b323bb2d4f72127a1fc7c0553b2789ac2 SHA-256: b4a992e3d55c47b707bfc02d1cdc63f049e684f39a35d51c1bcd79b77c699722
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to distribute traffic or obscure the final destination, likely for phishing or malware distribution.

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/wix?keyword=pokemon+fanfiction+ash+and+cynthia+lemon
    • https://static.usrfiles.com/ugd/b8c837_049435b7521a46c4a353f38bb6e5166b.pdf
    • https://static.usrfiles.com/ugd/b98abb_acbc427a591c4a3c8598f58614c72cfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f3b9c2cb1cd470db88665cd18bc7821.pdf
    • https://static.usrfiles.com/ugd/b8c837_e04cfbe82eb043ddbcb5868b31569016.pdf
    • https://cdn.shopify.com/s/files/1/0459/7248/8359/files/remimakuzosuzogulikab.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/95520096254.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/american_factory_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/anti_ragging_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/ptouch_1180_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5751/1590/files/88962317357.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/gebozaxasefemiwalozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80789229335.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_off00006367.bin
e950d58bb997608747a7bef9d8a1f6bf4884936e61546b4de12072d50a8d8af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5332 bytes
font_01_sfnt_off00007565.bin
b0350d935ccc7110a77269b314d70cdd56ce92fff276fdcca21d3450001c0893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7565 10012 bytes

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