Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdfab19973385e3…

MALICIOUS

PDF

45.4 KB Created: 2020-08-28 07:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7f3115e89805224e92bc11ab4558532 SHA-1: 45b510c4bcea54d64b6c323f5877a110209006d2 SHA-256: 8bdfab19973385e3fa5011a0b9bc25f0f8f2053f47fd31a4c83142d453ba726a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'cash flow statement' and the malicious URL itself. The PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier also strongly indicates malicious intent.

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://ttraff.cc/pify?keyword=cash+flow+statement+direct+method+qu
    • http://tifonag.ajameskolar.com/uploads/1/3/1/3/131381762/zezexufafub_motojegomowike.pdf
    • https://cdn.shopify.com/s/files/1/0437/3839/8869/files/jepekodeg.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/67196052238.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/14167635859.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/tewifapizoket.pdf
    • http://files.gcheng.people.ua.edu/uploads/1/3/1/4/131452799/tikedumeref.pdf
    • https://cdn.shopify.com/s/files/1/0432/8685/5840/files/atencion_alternante.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/13914752217.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/6513426188.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/56573691264.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/sexamiwikiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5772/files/neopets_kiko_pop.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/25260593344.pdf
    • https://cdn.shopify.com/s/files/1/0437/3954/5761/files/sudupegusupemifolafigivur.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/tnusrb_technical_hall_ticket.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ec9.bin
8d277473a3e6498fd77847895cdc004de3778827ba3558c9a620d6bd0b7b46a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC9 5384 bytes
font_01_sfnt_off000070ff.bin
8b4ca59b043f8d90922b1f85644d6e5e7c438b9e0f19b38cb9e7bc87585f8f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FF 9940 bytes
font_02_sfnt_off00009349.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9349 16092 bytes

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