Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf24acb76e58dd27…

MALICIOUS

PDF

49.2 KB Created: 2020-10-27 18:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8465383571c6b98adcbda6287125b8d3 SHA-1: 94d314c2f5660521d46cf78b68ee89cff26e4665 SHA-256: bf24acb76e58dd27ca37955bdf7b07f92b05cafc5fe424f38be67409a70efdec
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'gettraff.ru'. It also exhibits characteristics of a link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same malicious URL and other PDF links, suggesting an attempt to drive traffic to potentially harmful content.

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=atomos+y+moleculas
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5f968e8874340.pdf
    • https://cdn-cms.f-static.net/uploads/4387406/normal_5f95f09d53c78.pdf
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5f8e5b1b947f7.pdf
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f8d00473ec44.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8ea4bd515de.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f938d0b0508a.pdf
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f951a3e91fd3.pdf
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f8b4c4521d3c.pdf
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f973dbe2902f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusori/diteminikivobowexuranux.pdf
    • https://s3.amazonaws.com/tokafanawa/44160273101.pdf
    • https://s3.amazonaws.com/vogubivajavofu/incidencia_cancer_de_mama.pdf
    • https://cdn.shopify.com/s/files/1/0268/8158/9432/files/gunship_battle_helicopter_mod_apk_2.7.10.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/holt_spanish_3_expresate_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/1594/5890/files/23410001815.pdf
    • https://uploads.strikinglycdn.com/files/32db48f8-0dec-44a9-8fd9-eea8e5c8080c/92208974934.pdf
    • https://uploads.strikinglycdn.com/files/f1c5a455-bafa-4f8a-852d-f1055599aed1/dufakokut.pdf
    • https://s3.amazonaws.com/subud/50279020451.pdf
    • https://s3.amazonaws.com/zuxadol/le_journal_d_aurelie_laflamme_tome_2.pdf
    • https://s3.amazonaws.com/betefowubevat/1031614352.pdf
    • https://s3.amazonaws.com/xanebavifamopez/20348572749.pdf
    • https://s3.amazonaws.com/jukoxisojow/kuwujixutizojizup.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008f16.bin
9e8b79cdf28c8653428c33dc725e4bce3f6f382f2efdd75f8632f4c4aeb06608		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8F16 22824 bytes
font_00_sfnt_off00005c1f.bin
620f42751fde4a321684b9d45824041bd4faec053ea0243a36ae8edb468d5330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1F 4940 bytes
font_01_sfnt_off00006ce4.bin
36297c5f571f684ab968367c869d51e617700e7b9460657c1bb5419ef77558a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 10576 bytes

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