Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f9dd3ab0e77b2f…

MALICIOUS

PDF

52.8 KB Created: 2020-11-04 15:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe6168ffa396688fa7cbb0ed9c24333 SHA-1: 12302d06ce8d3e6b17b4415d977aca337016e150 SHA-256: 93f9dd3ab0e77b2f2bd51973229a06e04d9589d365cab9f92ffeaefdbe0ca9c4
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, with a primary link directing to a malicious redirector. The document body and embedded links suggest a lure for downloading cracked software, specifically mentioning 'nba 2k13 crack pc'. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates a high likelihood of malicious intent. No scripts were extracted, but the structure and embedded URLs point to a phishing or malware distribution attempt.

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/aws?keyword=download+nba+2k13+crack+pc
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f91c8900a6c8.pdf
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5f9f44433c314.pdf
    • https://duzozerijadid.weebly.com/uploads/1/3/4/4/134493401/2525030.pdf
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8a0852cc78d.pdf
    • http://gamescracks.net/52-nba2k13reloaded.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ea90a1ee-371e-4f59-806b-f58c53598393/taxakufewebo.pdf
    • https://uploads.strikinglycdn.com/files/5aa2d2b3-1904-4cd9-8499-5668c98acae0/tevaletaxenumibotovumif.pdf
    • https://uploads.strikinglycdn.com/files/d93d8e0d-f576-4565-aa7a-7c170ba12555/kill_box_rimworld.pdf
    • https://s3.amazonaws.com/pazifetanegapu/24944970369.pdf
    • https://cdn.shopify.com/s/files/1/0504/5226/7168/files/84848305357.pdf
    • https://s3.amazonaws.com/banula/49839566155.pdf
    • https://uploads.strikinglycdn.com/files/7fe4e35f-b15c-47a2-8d77-2787ece7ebf3/dojedoboxubu.pdf
    • https://s3.amazonaws.com/jedaxopopuko/vizio_soundbar_with_subwoofer_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008a3f.bin
2f7780c89c5364e1e1944822355313b921d9cb159bdf1dff196f13e347cdb9a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8A3F 25940 bytes
font_00_sfnt_off000054b9.bin
7b23ba73f18c29c03fe7ddcbdc7fd239b6a7704372c6c4d3553d80c77dbc73a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B9 5072 bytes
font_01_sfnt_off0000660b.bin
65d728ddd668d56aa84befeaa258287af776cbc70e527eedd076c8f27ddd4b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 10464 bytes
font_03_sfnt_off0000b846.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 4324 bytes

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