Malicious PDF — malware analysis report

Static analysis result for SHA-256 898c54febd1f3fa9…

MALICIOUS

PDF

40.5 KB Created: 2020-08-19 08:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0591276d91e97a9624dd5969d05e4c28 SHA-1: f7a3f57478cf88cc014b5f9208985cfaff16fe24 SHA-256: 898c54febd1f3fa9e7fc34c001ef4a7205580019421a95640f58a11b9b128e54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious due to its structure, which includes a large number of embedded links. The primary link, 'https://ttraff.com/pify?keyword=caterpillar+inc.+annual+report', is flagged as a known malicious redirector. The document body, though partially corrupted, contains text suggesting it is masquerading as a "Caterpillar inc. annual report" to deceive users into clicking these malicious links.

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=caterpillar+inc.+annual+report
    • http://lidebu.oliviergueant.com/uploads/1/3/1/0/131070487/118571.pdf
    • http://gasopev.stillyriveryarns.com/uploads/1/3/0/7/130738884/bigul.pdf
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130740344/fa8b50ce.pdf
    • http://mizoral.rugbysafetynetwork.org/uploads/1/3/2/8/132814930/gelukorevopapuwujila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5164/5093/files/85543389999.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/99606620697.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6466/files/firestick_remote_app.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/viwigubotidarir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/chemistry_acid_base_neutralization_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/4237/7623/files/rizezavexanola.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2220/files/75931640943.pdf
    • https://cdn.shopify.com/s/files/1/0438/3771/8690/files/36015864220.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/annihilation_of_caste_book_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/masijapimere.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006185.bin
0d7933b54632d0513b59c13461b660a576157067395e9e2f581753a58778e643
pdf-font-stream PDF embedded font (sfnt) at offset 0x6185 4684 bytes
font_01_sfnt_off0000717e.bin
4b2f00a999912ff693dbf4318e8b312bb0682e1cbe2cf9fb59b8964f7ff068a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x717E 10420 bytes