Malicious PDF — malware analysis report

Static analysis result for SHA-256 393277a6ed1aeae8…

MALICIOUS

PDF

68.3 KB Created: 2020-11-20 22:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1de05fae4c4c48960be80c861d93b4b SHA-1: df0d683af0d7f583478c941d3ae56b8405c476c3 SHA-256: 393277a6ed1aeae8daa2d53457b26404a74e89d4cd5e3612155b4657a86155c8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a redirector link farm. The primary URL, 'https://gettraff.ru/123?utm_term=native+american+justice', is flagged as malicious. This suggests the document's purpose is to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and link farm indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=native+american+justice
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8b674a6a50e.pdf
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fa2ae2b3d66d.pdf
    • https://kuvegegujumil.weebly.com/uploads/1/3/4/3/134367432/nowam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/522a41ac-dfc3-4fef-89be-feb35023b904/xazivu.pdf
    • https://uploads.strikinglycdn.com/files/261f386d-80b7-4bac-960c-b7b1e9b4914d/nyu_stern_reserve_a_room.pdf
    • https://uploads.strikinglycdn.com/files/79b85469-7c6e-49c8-9fe7-8f25cc2a0452/mukoni.pdf
    • https://uploads.strikinglycdn.com/files/1c28b3d0-ae15-44ea-b171-89e2c5006ddc/pekumulukisezonovaretej.pdf
    • https://uploads.strikinglycdn.com/files/2542bbb4-4c74-484f-8797-8adb5989bb56/exercice_corrig_cycle_de_vie_dun_produit.pdf
    • https://s3.amazonaws.com/lefemijip/definicion_de_temblor.pdf
    • https://uploads.strikinglycdn.com/files/4a6a3c66-e283-4b08-8731-3128100d0247/70677624155.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c451.bin
0540abb9042d3a3792bb5e6b99f8135d0bbb1add82356456a5a5120634609ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC451 4788 bytes
font_01_sfnt_off0000d47c.bin
863849607bc50222de47d87c870cbc9f3557f41d9dc87bd072d3abcf772e3573		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 10048 bytes
font_02_sfnt_off0000f69d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 4324 bytes

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