Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f79a2775d3036be…

MALICIOUS

PDF

46.2 KB Created: 2020-10-23 02:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1561d6a1747598d1c3eb9054b9830b SHA-1: 119a7b53f147360d73c6dc5462c58555bc5cd232 SHA-256: 5f79a2775d3036beda4c11d6373b8ed297e422dc968a131ed17684252ed616a9
154 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://gettraff.ru/123?keyword=cfa+institute+level+1+books+pdf', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and references 'CFA institute level 1 books pdf', suggesting a phishing or scam lure. The presence of numerous other links points to a link farm or redirector strategy.

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://gettraff.ru/123?keyword=cfa+institute+level+1+books+pdf
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f874fe2df846.pdf
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5f8af3f62ccaa.pdf
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5f9212040fbf4.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f876013461e1.pdf
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5f9116f418137.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3485354d-a663-49f0-bc45-5a7a30aa0126/xagiwibab.pdf
    • https://uploads.strikinglycdn.com/files/3c961600-a9f4-44f7-a0da-f13b0c2645e7/ejemplos_de_tesis_de_contabilidad.pdf
    • https://uploads.strikinglycdn.com/files/eb46a3a1-68d3-43d0-9963-9ddce55bd7d9/82488656937.pdf
    • https://uploads.strikinglycdn.com/files/52e735c5-f078-4897-8c10-b4aacfe595c7/buzimozepozufitukalo.pdf
    • https://cdn.shopify.com/s/files/1/0501/8180/0120/files/51332976754.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/rosephanye_powell_ssa.pdf
    • https://cdn.shopify.com/s/files/1/0266/9536/8888/files/vented_gas_fireplace_instructions.pdf
    • https://s3.amazonaws.com/bojafazes/17557568339.pdf
    • https://s3.amazonaws.com/sugaguxagu/71745753000.pdf
    • https://s3.amazonaws.com/zuxadol/59750100729.pdf
    • https://s3.amazonaws.com/mijedusovineti/kutabakukinonipiridisoz.pdf
    • https://s3.amazonaws.com/subud/begatare.pdf
    • https://s3.amazonaws.com/divelatoxa/17972959141.pdf
    • https://s3.amazonaws.com/toguvaju/javascript_design_patterns_o_reilly_download.pdf
    • https://uploads.strikinglycdn.com/files/fbc6e40e-1036-42d6-8a2c-125eb988270b/gagatobosisivexawolo.pdf
    • https://uploads.strikinglycdn.com/files/bf43a20e-5467-427f-994e-175e8a2caf72/jepasadabunukokejedumu.pdf
    • https://uploads.strikinglycdn.com/files/c7b01878-9646-4c58-aeaa-ba70841fabaf/79863864146.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_off00006e2a.bin
8f63b2411475d60fbb084f265ad5f45465cb8bb9c75c3892a04c7de228a5e02d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2A 5160 bytes
font_01_sfnt_off00007fd0.bin
f07776b002c377ee18ed324c5f4353f6facf594127d557934fcb0606f4f1ceaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD0 12624 bytes

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