Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba60fa72e7c7fa4…

MALICIOUS

PDF

42.4 KB Created: 2020-07-25 05:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6fffd2c97f5ce5bb749ba531dc7861a SHA-1: 88b8e7730dd10d47140d7ab52f1abb268f8a16ac SHA-256: 6ba60fa72e7c7fa4ac5042e6be1d0f4e7e490dc344ae63e6bff67754b8f98e2e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document masquerades as tax form instructions to deceive the user. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (ttraff.ru). The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a fraudulent advance-fee scheme, likely involving fake lottery winnings or parcel delivery requirements. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious intent to redirect users to potentially harmful content.

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=amended+form+1041+instructions
    • http://files.mectacprinstructor.com/uploads/1/3/1/4/131437740/2f469132278.pdf
    • http://files.bestkidintheworld.org/uploads/1/3/1/6/131636828/goxezopezopuped_madukufev.pdf
    • http://files.61percent.uk/uploads/1/3/1/3/131398145/fiseporozeju-jujivaruwovuta.pdf
    • http://files.statebirdtogo.com/uploads/1/3/2/7/132710687/a1b067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/fezopixuvikiximidi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8353/files/posapoguket.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/25820678709.pdf
    • https://cdn.shopify.com/s/files/1/0436/1555/1651/files/5514210351.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/27001577995.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/diganesarajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/jezan.pdf
    • https://cdn.shopify.com/s/files/1/0432/1234/1416/files/54256000474.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4237/files/galiwupasefulesanufivam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/rusiwusojululu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0762/files/suverabetujokun.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/28422734107.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/boresejerug.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_off00006629.bin
3ddc18463cd17c08fe091ce54243c8d047ad47fadda073a837efa36d0491295d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6629 5080 bytes
font_01_sfnt_off0000775b.bin
60b83ef53625945d8a7ff65be75d6f3eba9e2f685e5788797d19ccc0912febdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 11112 bytes

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