Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b7a00088cb464e…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 19:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1055e31e3662a4d7b4e20b83f30cae17 SHA-1: 60bda328823314ccea34ed731b7ee79e6c93aa9e SHA-256: 04b7a00088cb464e596e223860638e135dd9bf4864e9cb9e648183259be59483
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be part of a link farm strategy, likely for SEO poisoning or to drive traffic to malicious sites.

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=butterflies+are+free+full+play+pdf
    • http://xobaj.angelscafesharon.com/uploads/1/3/1/8/131857920/nafokodupe-tegemutaji-vimapevotoj.pdf
    • http://sukeg.sabrinamarasigan.com/uploads/1/3/2/6/132682883/50777790862.pdf
    • http://mideropef.voiceensemble.org/uploads/1/3/0/8/130874655/fokazadevabibab_zuxis_luluroz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/is_pogo_free_to_play.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/gamipogaviveroja.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/57483167160.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/dojogezujimonomen.pdf
    • https://cdn.shopify.com/s/files/1/0440/0935/7477/files/sozidebanasepimubejafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/83501181836.pdf
    • https://cdn.shopify.com/s/files/1/0450/6199/6694/files/comidas_saludables_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/demakugipujaxijobedijem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8275/9836/files/80795564988.pdf
    • https://cdn.shopify.com/s/files/1/0429/4072/7463/files/cavatina_duet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/tokadixesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/automotive_can_bus_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/rajuronorabebasugojeseg.pdf
    • https://cdn.shopify.com/s/files/1/0438/0835/8561/files/gladiators_weapon_crossword_clue.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_off0000758a.bin
ae12bb16df2d486e978a937be64fbba41640298ee4f88fa7fbfa5fa04caecd16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758A 5188 bytes
font_01_sfnt_off0000874b.bin
c10965c7ffb4285b2267f32aa9c53a7f08f91a0b5d559d691d21cbe142747756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 10236 bytes

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