Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec2d700648d2806…

MALICIOUS

PDF

46.1 KB Created: 2020-08-15 09:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c43265bc5f4e4d0a724a456d408a1e SHA-1: e6fcc45f95a84a7a631ecc969e1deec07915df9a SHA-256: 0ec2d700648d28065ae7b0b7314fc91b4f46edf3a2dd932198455c561fca4637
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wb?keyword=flew%20over%20the%20cuckoo's%20nest%20pdf'. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, potentially for phishing or malware distribution.

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/wb?keyword=flew%20over%20the%20cuckoo
    • http://rafazuke.donshort-artscaper.com/uploads/1/3/1/4/131452903/5662489.pdf
    • http://pusewe.barbsfishing.com/uploads/1/3/1/1/131163635/d3c5e3145a86cea.pdf
    • http://dawadotid.jingleexpert.com/uploads/1/3/1/4/131437423/390175.pdf
    • http://riweti.rosevilleconnect.com/uploads/1/3/0/9/130969060/rexapi_notitenat.pdf
    • http://files.wyomingbeaglebeauties.com/uploads/1/3/1/6/131636825/kewaxumunakaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0453/6434/7035/files/45654061032.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/zakopepajujaxopimitagod.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/fitudilazokelegukazo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/91129245072.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5592/files/12893355056.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/9906250065.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/english_to_afrikaans_dictionary_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0450/0973/1734/files/six_sigma_black_belt_training.pdf
    • https://cdn.shopify.com/s/files/1/0449/1198/4795/files/split_merge_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/biomaterials_for_clinical_applications.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/the_sea_of_thieves.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_off0000664a.bin
3a8cbc18a36b35491981ef1b5dd99d55418e68d849aa7a68931fd648a18d179f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664A 5072 bytes
font_01_sfnt_off000077a6.bin
3587e8621fa8e23cda11c9a55945d0780f9bc174b33b93fde4205319049bba8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A6 11096 bytes
font_02_sfnt_off00009bcd.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCD 4324 bytes

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