Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c67f1e5e921c4e…

MALICIOUS

PDF

34.7 KB Created: 2020-08-29 01:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0d7541a7d69d6bfee8a353b00d60749 SHA-1: 03e3695a75df324ad9b95c2654f4e0910ff67378 SHA-256: f8c67f1e5e921c4e8e9c030635e810877ed8594c7ab5fbee809678ec23fd691f
152 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The heuristic firings indicate this PDF is a link farm designed to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this document. No scripts were extracted from this sample.

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.ru/wix?keyword=yamaha+ef1000+generator+parts+manual
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/vexebemaveb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/41055523679.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/barney_i_love_you_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/44167007564.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6040/files/pipokewanosapolubofozover.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/10555245832.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/58540413498.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/zesoxedaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbcd355dca4b453e893ae47c2ec72677.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef698924a61c4b1e9fa3640e73b71dec.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5881/files/vcut_kitle_indeksi_nasl_hesaplanr_forml.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6909/files/jamanosabanazuxosugozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/bel_canto_singing.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/kozijej.pdf
    • https://cdn.shopify.com/s/files/1/0435/0623/7604/files/35247366924.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_off000041a0.bin
082c89522e4251f0a814862fddf633b1dac669eb780a02580130c1f52bfffe84
pdf-font-stream PDF embedded font (sfnt) at offset 0x41A0 3312 bytes
font_01_sfnt_off00004d81.bin
54a9fcf6142775289ffefd6ea472ad974a29dded071e2c7373ec803191d128f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D81 5468 bytes
font_02_sfnt_off00005ff8.bin
01895bdd7f7317fb189c2da3d693a8f53f697c44135551456e7534903e639209
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 8708 bytes