Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fb87a85bea293d…

MALICIOUS

PDF

35.7 KB Created: 2020-08-11 01:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c751d36e2689599036e5a6b455f9622e SHA-1: 8184c04fc5b4d7f38fcc739815fae5122541de1d SHA-256: d1fb87a85bea293dec12770e7d6ebb892ed414f6efd7e51b4a32e30b10d1b14e
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains but ultimately redirect to a known malicious redirector at 'ttraff.ru'. This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

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=mastitis+metritis+agalactia+en+cerdos+pdf
    • http://files.salinemiddleschoolchoirs.com/uploads/1/3/1/4/131405956/43028f15a0.pdf
    • http://files.ijcai-boom.org/uploads/1/3/0/8/130814308/206b3.pdf
    • http://files.pinegrovecogop.org/uploads/1/3/0/8/130874318/de351d21ce3806f.pdf
    • http://files.barrygjohnsonsr.com/uploads/1/3/0/7/130739379/dce28.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/mokavadoliwatexufetum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/94797808040.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/kojazavusozas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/malazapuxewig.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/xakolodabivosutab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/81086956620.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45035229099.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/39205632138.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7560/files/marcy_mwm-_988.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5645/files/a_year_and_a_day_virginia_henley_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9916/8673/files/jigebugurovakomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/zunugap.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_off00004d56.bin
e28f3ee2edda161e9d3ac6a57168f9298326037e75e022a00edf85dd57e11f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D56 5480 bytes
font_01_sfnt_off00005fe0.bin
1f2f5395b7f4ab9d722a64c1e082639dfb64897dbe42ea716645552635bb4502
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 9872 bytes