Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4a4d7dd2efb75c…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 17:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 385111686e19a4b65ca7bbe2db85ebac SHA-1: 7fba8be932e18e06a763e894785d6ab3f4cdbd62 SHA-256: 2d4a4d7dd2efb75cf5fc953c86685e64f59478ed324a332efdae13a257dc542f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a 'dog age converter'. This heuristic, combined with the ML classifier's high confidence, strongly suggests a phishing or redirection attempt. The document body, though heavily obfuscated, contains the malicious URL and numerous other PDF links, indicating a link farm strategy 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.cc/wix?keyword=dog+age+converter
    • https://static.usrfiles.com/ugd/b8c837_04040f7608d74a0495fb67801fd37b0b.pdf
    • https://static.usrfiles.com/ugd/eaf48f_9f3600f53e354749ae1736f7571cd180.pdf
    • https://static.usrfiles.com/ugd/b8c837_278e3a57eae84c0eab8999e0be6f1c5e.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/90363210389.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/3611124612.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad908162b8fe44ed80bf2d3668d8be69.pdf
    • https://static.usrfiles.com/ugd/5de1df_4079df3ce8fe41de8e88286168a11841.pdf
    • https://static.usrfiles.com/ugd/0a052f_9a2a0945e930404fbbe1f4bed839e579.pdf
    • https://static.usrfiles.com/ugd/b4609a_5a0efced87cc4a00a7fc1a7ee0fb1eb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2af1e18c72d34a6d8b8d538edc684766.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/68424240574.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4902/files/roland_barthes_image_music_text.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/pusadozupizuwuve.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000635d.bin
941fe811f4f975642c1787c997484955ecc071d924feee119473ce0c9ccda2d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 4556 bytes
font_01_sfnt_off000072e5.bin
c87bae435b8dd4bbdb7d69ea4383be31e52bb805df61b7d0dff5abc05ce4de75
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E5 10924 bytes
font_02_sfnt_off000097c6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x97C6 4324 bytes