Malicious PDF — malware analysis report

Static analysis result for SHA-256 1643b886a850a300…

MALICIOUS

PDF

43.3 KB Created: 2020-08-23 23:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c987e305601e823668aea96cff010fd4 SHA-1: 132e64bfe695e52c22695840f40e2f6318486438 SHA-256: 1643b886a850a300f69a1113a896c9fbba564c78f66e2160ba3466d19936e959
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed for SEO manipulation or to host malicious content. One prominent link redirects to 'ttraff.ru', identified as malicious redirector infrastructure. The ML classifier also 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.ru/pify?keyword=satellite+communication+objective+type+questions+and+answers
    • http://files.jmyrsiadeseportfolio.com/uploads/1/3/0/7/130775760/9316652.pdf
    • http://waxab.kauaifoodofthegods.com/uploads/1/3/1/4/131483281/gamovivalip.pdf
    • http://files.weddingstationerybyamanda.com/uploads/1/3/0/7/130775137/vopanerumoxisud_megute_jozivulazet_wizev.pdf
    • http://baligoze.newnarrativesinphilosophy.net/uploads/1/3/1/8/131871864/2774324.pdf
    • http://laxunu.riceroadchurch.com/uploads/1/3/1/6/131636719/sitaduxaxuti-wisuv-vupifatotav-famujez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5864/2595/files/bebofinefigovujej.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/john_lewis_pet_insurance_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/57809736810.pdf
    • https://cdn.shopify.com/s/files/1/0428/9393/4748/files/antiquities_act_1975.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/24433010377.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/how_to_download_a_vimeo_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/dekelezegogones.pdf
    • https://cdn.shopify.com/s/files/1/0440/8400/2981/files/jevonuvabufizexefur.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/4563439631.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/36775774034.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_off00006878.bin
bd2002258def924944d4215332e571cca75ffaa3a8e2f1834327ecd3c721c24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6878 5920 bytes
font_01_sfnt_off00007c8b.bin
7389741a1312d4c69516ea20491c2c5e3853883f0b65d6f0ee7cdb4c6dfe4619
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8B 10408 bytes