Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a8086135ec4956…

MALICIOUS

PDF

53.0 KB Created: 2020-08-17 15:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec378ee2359f62ba8c2161c8fee2aede SHA-1: cb87c44560160b5677c23e411a4b8ce3127b8ec7 SHA-256: 37a8086135ec49561fb0a484891c8f3e40eed4ee7d185897083006bda41e9367
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though partially corrupted, includes the same URL and a keyword related to medication side effects, suggesting a lure. The presence of numerous other links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=metformina+efectos+secundarios+hepaticos
    • http://xafix.michaelshusko.com/uploads/1/3/0/7/130740497/pedofune.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1845/files/git_mac_os.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/jurnal_akuntansi_perubahan_harga.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/facebook_blueprint_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/fundamentals_of_engineering_economics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0438/9876/5480/files/3725891104.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/vesafuvepoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/nafikejotafomidugoxeriwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9262/9917/files/93890167044.pdf
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/vizomeleguvewedumoniwefo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/2007_ford_focus_owners_manual.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_off000077aa.bin
4fa0a4dbf07d3fef001cc537b0d8b9030c626db67ebe1f512720380e711b8d73
pdf-font-stream PDF embedded font (sfnt) at offset 0x77AA 5368 bytes
font_01_sfnt_off000089c3.bin
f98783534e2faf851dba26ad74e955416b0622c88f89b32d532b30e1164a9045
pdf-font-stream PDF embedded font (sfnt) at offset 0x89C3 11588 bytes
font_02_sfnt_off0000afd4.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD4 16204 bytes