Malicious PDF — malware analysis report

Static analysis result for SHA-256 73984be66923a540…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 03:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86281a33067eec05d025ee4c7384cce1 SHA-1: f437cd3d4540c652a59e34fc828934c120c9ee58 SHA-256: 73984be66923a540f4d04b89a0ac66a2a0a0984538ba68f2111f7d5f96bb1c7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests an attempt to leverage SEO tactics or a link farm to obscure malicious destinations. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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.ru/pify?keyword=kareena+kapoor+picture
    • http://kawawupim.jesslyonphotography.com/uploads/1/3/2/6/132683014/5ae436026acbb.pdf
    • http://kijite.mowaxdiscography.com/uploads/1/3/1/4/131406086/f870aa.pdf
    • http://files.learningtolearn-differently.com/uploads/1/3/2/6/132695329/72eb7.pdf
    • http://files.baldmanandhumans.com/uploads/1/3/1/6/131606492/wuzonupene.pdf
    • http://files.plumislandweavingco.com/uploads/1/3/0/7/130738676/loxod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6091/9461/files/87015374100.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/equipment_in_microbiology_lab.pdf
    • https://cdn.shopify.com/s/files/1/0435/7780/2911/files/kuxitugasozajobodit.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/android_tv_box_remote_setup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/27219857544.pdf
    • https://cdn.shopify.com/s/files/1/0463/3323/1266/files/depreciation_recapture_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/41318510004.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0976/files/letter_tracing_worksheets_b.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/19543740648.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/dolphin_emulator_android_note_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/vekaburadebiniraxo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ed5.bin
0175c13a20f5ddcd7020f18d14e0bbbc6679651fa4cd5ef08081d1a24cb521c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED5 4748 bytes
font_01_sfnt_off00005f08.bin
952de3ad4ef76a4bc494e8339dd7942a4d96ac936cd05a01b476f0947b27998f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F08 10116 bytes
font_02_sfnt_off000081d7.bin
794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D7 16168 bytes

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