Malicious PDF — malware analysis report

Static analysis result for SHA-256 835c97c64ae692a6…

MALICIOUS

PDF

43.8 KB Created: 2020-08-13 22:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1abd21d42246d5e75e56a05342231edc SHA-1: 658568c94836faf52a803841d603e3cba3d89d0e SHA-256: 835c97c64ae692a67b98413f9751c502f3132a1948c7a6e839ccead0145cbec9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though garbled, contains the text 'Conditional tenses english grammar pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of many external PDF links indicates a link farm, likely for SEO poisoning or to distribute 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/wb?keyword=conditional%20tenses%20english%20grammar%20pdf
    • http://files.threetimesluckyband.com/uploads/1/3/1/1/131164236/pobewekifap.pdf
    • http://files.teachitalian.co.uk/uploads/1/3/1/6/131607093/7748500.pdf
    • http://files.stcm.org.uk/uploads/1/3/1/4/131406344/somaroxisaxil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/6977/4750/files/kuxinedagutudemeturotadir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/dixusebokigave.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1729/files/exercise_for_ankylosing_spondylitis.pdf
    • https://cdn.shopify.com/s/files/1/0448/0139/2801/files/bangkok_tour_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/sunuxudasevegepasiku.pdf
    • https://cdn.shopify.com/s/files/1/0437/3187/8049/files/football_betting_strategies_that_work.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/case_study_psychology_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/42434911710.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/cabin_crew_safety_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/ruwowosimokapitumixizuwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/yellow_zinc_plating_process.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006146.bin
e3f688b0a39ec007a09a7c7674314e86a3cdcbfe54bc9dbd7eff14b665a25172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 5268 bytes
font_01_sfnt_off00007302.bin
b8dbbf4d09bcbc73a6ebed6cd979730925772f5a64f75a9629ab734d89a675b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7302 9628 bytes
font_02_sfnt_off00009406.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9406 4324 bytes

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