Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6cde97d65438d2…

MALICIOUS

PDF

45.0 KB Created: 2020-07-29 11:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7349be1e191c834c30926df90c7b0649 SHA-1: 0b8da07547fd07a10609924c66596ae8ef37c646 SHA-256: 0a6cde97d65438d29c93018d67334e3807e4a7abd44c150f183d5b2a211612b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external PDF links suggests a link farm or redirection scheme, potentially for SEO manipulation or to host further malicious content.

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=biconical+antenna+pdf
    • http://files.mobadanceacademyus.com/uploads/1/3/1/0/131070230/2b82cfd.pdf
    • http://files.tambowthewombat.com/uploads/1/3/0/7/130739369/netitobegavid-bisanudebifef.pdf
    • http://files.lightyearspress.com/uploads/1/3/2/6/132681812/xekogaraxubogozejo.pdf
    • http://files.lechicacademy.com/uploads/1/3/1/3/131398507/tekoj.pdf
    • http://files.petetherockman.org/uploads/1/3/2/6/132680855/9c8660d4e36320.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/kofiguwekukimized.pdf
    • https://cdn.shopify.com/s/files/1/0436/9154/0634/files/60092005146.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/zapopuvulonabusorini.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/xojelelagenado.pdf
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/28117295978.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/88109230730.pdf
    • https://cdn.shopify.com/s/files/1/0434/9332/7008/files/detunivikul.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/57967563321.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/89735843086.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/28040828520.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gikari.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_off000074db.bin
56c2d308451c6838ff9b3a8d4e5e90d57c13efbe3974645c3809334d72cc072c
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 4712 bytes
font_01_sfnt_off000084e2.bin
366b4c15f6338e329b9915e338bb935d5ab7c114ba032d06eff1c7a9f6dc4432
pdf-font-stream PDF embedded font (sfnt) at offset 0x84E2 9948 bytes