Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c1ad18241555e5…

MALICIOUS

PDF

44.2 KB Created: 2020-08-10 10:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f35a74ef00803727966aedcc48a88059 SHA-1: 9e8499ffc22aa657fd32a52abff986c9d6ef5285 SHA-256: f5c1ad18241555e552e03642e301537231803111aacaf81ecefe2015efa4082d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or content distribution network for malicious files. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the distribution of malicious links within the document.

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.com/pify?keyword=trilaminar+germ+disc+pdf
    • http://files.dunainwoods.com/uploads/1/3/0/8/130814830/3274228.pdf
    • http://migipomem.capecodcoastalhomeinsurance.com/uploads/1/3/1/4/131406717/5190922.pdf
    • http://files.rebelwebsolutions.com/uploads/1/3/2/6/132682076/867cb73faf1716.pdf
    • http://files.fazakascsaba.com/uploads/1/3/2/6/132681352/warogujumud.pdf
    • http://files.hesteryoga.co.uk/uploads/1/3/0/9/130969895/d72085c72cf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kopamidije.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/15783242113.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/26785648997.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/bojizizujebopapiwogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/days_and_months_in_spanish_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/wegeweniruf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/wedeverusirawun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7749/files/30716210585.pdf
    • https://cdn.shopify.com/s/files/1/0446/6468/4697/files/cambridge_igcse_physics_workbook_2nd_edition_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/gumaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7850/7934/files/13108022744.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7574/files/86661628447.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/27261258588.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/11682210449.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb4.bin
1a3d8e8f91a8711c03b9232288565689f2ec4996fbc99d342fd942cc3c8b30c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB4 5424 bytes
font_01_sfnt_off0000820e.bin
4d119d175e62f1c7fee0abf28d7b8dc5d9c9dadea4bb711f442e316ecb77052d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820E 9872 bytes

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