Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d19f59714d71d08…

MALICIOUS

PDF

67.8 KB Created: 2020-10-01 12:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f41689d9de226a96fa26b2957140b03 SHA-1: dfaa09665264c1fe660a9ee5b25c2137140341e5 SHA-256: 5d19f59714d71d08324b1921b1c5c78b14af1a54e80175fdd6905ffafacdc4a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://gettraff.ru/strik?keyword=sap+asset+strategy+and+performance+management+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many with numeric or generic slugs, indicates a link farm SEO tactic to disguise the malicious intent. No scripts were extracted, but the heuristic firings strongly suggest malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/strik?keyword=sap+asset+strategy+and+performance+management+pdf In PDF document text
    • http://files.littleleafflutestore.com/uploads/1/3/0/9/130969798/4974598.pdfIn PDF document text
    • http://files.mfhenna.com/uploads/1/3/0/7/130738870/38eafbec.pdfIn PDF document text
    • http://files.elkocountyreadingcouncil.com/uploads/1/3/0/7/130776349/debinamewukef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba4a849-2fde-4a85-8b27-dccbfdfd6ff5/dipalaxipidurabidez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31417bb0-a129-4f6b-92b0-58dec2a96ac3/menesinefomafuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c8137a-b7a5-4b87-9c97-4ad66f55c4de/6898121687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/98558546864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/76417439101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7627/9702/files/chris_stewart_nhl_contract.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 5648 bytes
SHA-256: 992e5ba9c230174de93f3b90d03cf8e910517b32d4e2a425e0bfdf7e14222c64
font_01_sfnt_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10572 bytes
SHA-256: 429065c815d5ae626cea3894750cb1d928b317c2f9c0fe25442bbc8c0b24fba9

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