Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e7b7c0154ba198…

MALICIOUS

PDF

39.0 KB Created: 2020-09-07 11:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c8fad8229f1d895e4d12c3d300ede0 SHA-1: 36d945986f354b02e36cfcbf49e25d1ff8098091 SHA-256: d8e7b7c0154ba1989ac83c27dc173bef01e6608dee6ace65d703a7a469be9298
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for sheet music, leading to `https://ttraff.me/wix?keyword=funkadelic+maggot+brain+sheet+music`. It also hosts a large number of other PDF files on Shopify domains, likely as part of an SEO link farm to obscure the malicious redirector. The ML classifier 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.me/wix?keyword=funkadelic+maggot+brain+sheet+music
    • https://cdn.shopify.com/s/files/1/0437/8122/6657/files/10256367105.pdf
    • https://cdn.shopify.com/s/files/1/0429/8758/5699/files/5796358141.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/tinatobadegizelumejojo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6681/8721/files/is_ember_prime_vaulted.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/auto_tune_plugins.pdf
    • https://cdn.shopify.com/s/files/1/0453/8466/3208/files/front_end_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/tirizezuvikevareri.pdf
    • https://cdn.shopify.com/s/files/1/0464/9202/5000/files/wizuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/mujazak.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/25637510857.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4284/files/65793142599.pdf
    • https://cdn.shopify.com/s/files/1/0434/8120/2854/files/logijakisuj.pdf
    • https://static.usrfiles.com/ugd/ed8107_092f7b0fbb1c460080caca99fcb50f57.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3a0e089808f47c389381177e87b4416.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_4770a41b5300445786adc1d30affb32c.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/
    • https://static.usrfiles.com/ugd/6cf0f5_4770a

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000597e.bin
3d6cf0c411dae5d8f3555e3419803143ec9304f4dc47c1196fa22b63c4d2bc1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x597E 5512 bytes
font_01_sfnt_off00006c10.bin
d72f4cb7cda38d0477f11bf9030d3c463ac480c05182a1aed38bc7213c965ce1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C10 10120 bytes