Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f6b56c38d43cab…

MALICIOUS

PDF

38.2 KB Created: 2020-08-29 13:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c86979bb9db8defdf23ac88dfe9d36c SHA-1: 835abd9cb716bc337c2c0f27f1a3fa11281812cc SHA-256: 21f6b56c38d43cab1dc0f8cabaa540c993b4abb6226eff58ea49ec4e6f54412b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=bill+nichols+introduction+to+documentary+pdf'. This URL is embedded within the document body, suggesting a lure to trick users into clicking. The PDF also exhibits characteristics of a link farm, with numerous links to other PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.com/wix?keyword=bill+nichols+introduction+to+documentary+pdf
    • https://cdn.shopify.com/s/files/1/0463/3971/9325/files/32433311456.pdf
    • https://cdn.shopify.com/s/files/1/0464/6528/6302/files/dajupetemipeligiwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/75026702140.pdf
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/aikawa_saki_anime.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/53741015396.pdf
    • https://cdn.shopify.com/s/files/1/0432/2852/8808/files/5599392476.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/makkar_ielts_speaking_download_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/foxifofuzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0151/0045/files/43784263836.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/neural_network_architectures_for_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0434/1599/4529/files/glorify_your_name_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/advertising_standards_authority_of_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0754/9338/files/nofifavi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/11218217513.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/athetosis_adalah.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_off00004cf4.bin
f53bc32a5edfd57b28b9a88bbe7bee1d4302c8a6eb9d674fb0167111b5a156f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF4 5428 bytes
font_01_sfnt_off00005f33.bin
cdbde827e304424f909e6311268b49a6e160cdd5b8133b650bd49d091756befb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F33 8928 bytes
font_02_sfnt_off00007d82.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D82 4324 bytes

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