Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b5b416098902b4…

MALICIOUS

PDF

41.7 KB Created: 2020-07-27 11:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66277c055d3737932774a56b805db91 SHA-1: a239de27f5ab0d3432c51dc85cf7bb60ebdb0fd9 SHA-256: 84b5b416098902b473988741cf77df6a479be6c53358e71e0797b20879dac16f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded links, many of which point to a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. Another heuristic flagged the document as an advance-fee scam lure, indicating a fraudulent intent. The document body, though heavily obfuscated, contains keywords related to mandate forms and details, aligning with the scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=mandate+form+details
    • http://files.salfordartclub.com/uploads/1/3/1/4/131406592/vizalusab-vupomaj.pdf
    • http://files.midwest-healingcbdmassagestudio.com/uploads/1/3/2/6/132695438/9012044.pdf
    • http://files.vcjcostumes.com/uploads/1/3/1/6/131637055/7121900.pdf
    • http://files.gatheringsemporium.org/uploads/1/3/2/8/132814427/nijemiladasiruz.pdf
    • http://files.aimdistributing.net/uploads/1/3/1/4/131408415/d232645f979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/ruxofudezejoveseki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7815/6449/files/58255074905.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/45914916907.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/bazojup.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/vafuzupalewise.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6646/files/sozadoxozetidigelinir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/90587276603.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/31194340306.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/kuvusafisupovolajogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/9914113638.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_off00006889.bin
bbd72d170b532d8e3fd4c7dd58382578af51d5906c236deaa17f3258d4ec5efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6889 4844 bytes
font_01_sfnt_off000078e1.bin
d79033f633ce21163fb9f43850062f4f05b65cd0ad4e6bd59972043b3aafec28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 9652 bytes

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