Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d0a18d79984c71…

MALICIOUS

PDF

44.0 KB Created: 2020-07-30 13:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09a08da46e2c3546891c205abc0e35c SHA-1: f76ff484dbe90f1dd15e2fb638afc763a65f1f3b SHA-256: 85d0a18d79984c71222b311dacd2b4a75ac650f28625bc93ff04e2aac219da7e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `ttraff.ru`. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which point to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link within the document.

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/pify?keyword=agendas+alternatives+and+public+policies+pdf+download
    • http://files.easternshoreyoungadults.com/uploads/1/3/1/3/131383964/515006.pdf
    • http://files.nicolezeng.com/uploads/1/3/2/7/132712163/4401912.pdf
    • http://files.bridgetmckennaart.com/uploads/1/3/1/3/131379396/bevitojodageva.pdf
    • http://files.tortoisecove.com/uploads/1/3/1/8/131856852/nefut.pdf
    • http://files.simplydivinesuds.com/uploads/1/3/1/4/131407812/23f3d849.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorirazapevimixawas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/7731618881.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/tofolag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/veletogirenoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/gimulatesegugifemi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/3254332759.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/26969203709.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/binapoximujasulufegoxapal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4390/4927/files/4421307440.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3215/files/sifil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/pogalaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/93981457584.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://cdn.shopify.com/s/files/1/0430/4509/3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c44.bin
01d470a622ec3d4054dccfefe98f2efca1bed5a36968e829435d9c3ed3f75288
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C44 5484 bytes
font_01_sfnt_off00007f02.bin
dc4fc5af455256e0166f6346c4da13b81b7d88b534ef011a33504a0c91e3609a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F02 10412 bytes