Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f98b6dcf275fc6…

MALICIOUS

PDF

53.4 KB Created: 2020-08-06 21:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 017708514273819fe9274df933b7812a SHA-1: 026cd3ca7369e9596e35816f44c046fb504e95d1 SHA-256: 77f98b6dcf275fc68eb70947513240e6dc5de0257f43a205a6527697f965a15c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'business english accounting vocabulary pdf' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many pointing to Shopify, indicates a potential SEO link farm or content manipulation strategy.

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=business+english+accounting+vocabulary+pdf
    • http://duwupose.rayzinkanefarm.com/uploads/1/3/1/4/131408738/jezuvo-pixavoga-vifavutosiv-mexedijisasuled.pdf
    • http://files.sarahcamillewilson.com/uploads/1/3/1/3/131383456/titalafumuwiza.pdf
    • http://files.uaassociation.org/uploads/1/3/2/6/132681026/rilabunorakigipadege.pdf
    • http://dupivu.themainstreetmommy.com/uploads/1/3/0/9/130969744/tetudikikedinu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/destin_weather_20_day_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/80174703375.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6967/files/91675092365.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0431/6944/8097/files/71067740939.pdf
    • https://cdn.shopify.com/s/files/1/0435/5670/0319/files/accommodations_and_modifications_for_students_with_disabilities.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/28747637867.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/81257776519.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/kopinovipibufonokim.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/78493935526.pdf
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/87147895337.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/topikedagedolimajonu.pdf
    • https://traffic.libsyn.com/bizpod/BEP355-Taxes1.mp3
    • 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_off00008484.bin
a8d361838a784f5ecb3ce4252122ed28154f7a1e432354777bbe1de91ffc39a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8484 5652 bytes
font_01_sfnt_off000097b8.bin
d9653b289c553d917b508946e186065ffc558c7287cb5930ef64ba5d1839f59c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B8 10120 bytes
font_02_sfnt_off0000ba5a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 4324 bytes

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