Malicious PDF — malware analysis report

Static analysis result for SHA-256 9439270ca5351b3b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-11 19:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a383152ff4c51f0eeb93e1db8ebd090 SHA-1: f59718d32bbc005ceb76cddc42718d99124854f3 SHA-256: 9439270ca5351b3bbcab477cf91a96b9c70b10f064b8e902533dc68f714ad597
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to further malicious content. The document also exhibits characteristics of an SEO link farm, with numerous links pointing to PDF files hosted on various domains, including Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

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.cc/pify?keyword=carboxiterapia+flacidez+pdf
    • http://files.d17teachers.com/uploads/1/3/2/6/132695531/2669295.pdf
    • http://files.mappingnorthumbria.com/uploads/1/3/1/4/131453753/5324816.pdf
    • http://files.bencoga.com/uploads/1/3/1/4/131408280/vafubufijego.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/nimubowaxibejabixavawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/neurofibromatosis_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7688/files/mugodumaxitiruta.pdf
    • https://cdn.shopify.com/s/files/1/0433/2467/0105/files/duxonugebavonejezesum.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6581/files/6558188704.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/27343649516.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/67970709816.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/a_level_biology_cell_structure_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/kanotowabitujewoxip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/89866787135.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8833/files/insta_house_mod_for_minecraft_pe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b8.bin
07975981d84b4fe746b7ed4e75bcbb325b484b4f020bf4cad1b0f48e66e60984
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 5132 bytes
font_01_sfnt_off00007647.bin
359da5275255baa2323ef5f6bbcb49c8c011e8cc28cdf96ac439772627ed780d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 10244 bytes