Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb1461e3cc915d4…

MALICIOUS

PDF

47.5 KB Created: 2020-08-16 13:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8830de2b1cccc29db4f2ff5183f02d98 SHA-1: 95d63c68ec020f611be65597e9acb6029bcf9e94 SHA-256: 0bb1461e3cc915d41a7ad19cac71cebd08665b9a895edb2987fadd0753c9d66d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains a lure related to a "biochemistry study guide answer key" and embeds a link to `https://ttraff.com/pify?keyword=biochemistry+study+guide+answer+key`. This URL is flagged as a malicious redirector. The heuristic `SE_ADVANCE_FEE_SCAM_LURE` strongly suggests this is an advance-fee fraud attempt, likely aiming to trick the user into paying for fake goods or services. The PDF also contains a large number of links to Shopify-hosted PDFs, indicating a link farm used for SEO manipulation or to obscure the malicious redirector.

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.com/pify?keyword=biochemistry+study+guide+answer+key
    • http://gababen.michaeldalberg.info/uploads/1/3/1/4/131453574/jaxezulune.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/63659725612.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/jesaguvororu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/lilowoduset.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/lebisewejosiraxamopix.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/wozirepenifafesuxutajew.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1813/files/80072104161.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/heather_rock_of_love.pdf
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/80693647531.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/84615475141.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/1201774986.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_off000079c9.bin
c886bf4df63340ebf871617dcc09eb2ddc3a382371848810407eff8e07e43249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C9 5628 bytes
font_01_sfnt_off00008cd6.bin
38e5d55dcc4759918c0fbc10613694c8fa3066cc24c8648fbda82dd5a452f5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD6 10760 bytes

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