Malicious PDF — malware analysis report

Static analysis result for SHA-256 77711f600b762920…

MALICIOUS

PDF

42.4 KB Created: 2020-10-06 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcbb20a60fece3e4ad153e21daf13a0a SHA-1: 55972fe14211e85e3beaf11f3eee3ca70767827e SHA-256: 77711f600b762920d2742f527f16360701792af0413583a3ad5c7daf7ef3958c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=ishihara+colour+blindness+test+24+plate+pdf
    • http://kinul.boldncreative.com/uploads/1/3/1/4/131453027/fufiw.pdf
    • http://linelow.valleythreadz.com/uploads/1/3/0/7/130775732/6524845.pdf
    • http://kuveka.strazzanti-photography.com/uploads/1/3/0/7/130738732/2382702.pdf
    • http://files.adrienneraphel.com/uploads/1/3/1/3/131383426/ripozofetop.pdf
    • http://files.camdenscrusade.com/uploads/1/3/1/8/131856619/fc0f2c5e56200.pdf
    • https://site-1036851.mozfiles.com/files/1036851/fibovuxosako.pdf
    • https://site-1036748.mozfiles.com/files/1036748/70199908486.pdf
    • https://site-1038949.mozfiles.com/files/1038949/memulofigemifo.pdf
    • https://site-1042504.mozfiles.com/files/1042504/75670101422.pdf
    • https://site-1043603.mozfiles.com/files/1043603/sorutoxidazufeze.pdf
    • https://site-1036737.mozfiles.com/files/1036737/xatekiboze.pdf
    • https://site-1042354.mozfiles.com/files/1042354/wakaxetodaz.pdf
    • https://site-1039711.mozfiles.com/files/1039711/79669223834.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9667/7279/files/the_teenagers_guide_to_the_real_world.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/bijezezoxoguronuzawir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4508/4574/files/donna_derrico_nude.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/6.1_chromosomes_and_meiosis_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/8649/3349/files/shark_dating_simulator_endings_unblocked.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_off000065de.bin
d9dadfaf2d879fabb27cbc9f9552ae068b731204d4b88bb6c2982b3a91698b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DE 5540 bytes
font_01_sfnt_off000078ae.bin
731f4337b455e04f22db5d805ed6a8954efba7bf36706f1d2361b33778b6fe7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AE 10456 bytes

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