Malicious PDF — malware analysis report

Static analysis result for SHA-256 409416d67c448220…

MALICIOUS

PDF

45.5 KB Created: 2020-08-30 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d943b8e1be1b4895ac0a3060820d1857 SHA-1: 94761dcfacbb725e08b687377ae606e3f833dc26 SHA-256: 409416d67c4482206322db07a5b416b98ab0c4f9ae69a271da841a88d45d7095
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=a+comme+amour+piano+sheet+pdf'. The document body, though heavily corrupted, also contains this URL and references to 'piano sheet pdf', suggesting a lure. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, indicates a link farm strategy, likely to improve SEO for the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=a+comme+amour+piano+sheet+pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dcbb7440464f94805d8184ef6f772f.pdf
    • https://static.usrfiles.com/ugd/4b874d_76fc87d71dbd4270a01d23aa6881787b.pdf
    • https://cdn.shopify.com/s/files/1/0460/6119/1323/files/a3_tri_fold_brochure_template_indesign.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/bupidifobu.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e363015ff504085a3de576f5df0ec33.pdf
    • https://static.usrfiles.com/ugd/d775a9_169fc29b81c941f8a25af16cad9fd377.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec3d689228164c1db9f51abafd93d476.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/duzetefezomibuligujigo.pdf
    • https://cdn.shopify.com/s/files/1/0469/9793/0136/files/61267021422.pdf
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/16683425646.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/farozujopife.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b8.bin
a7d319a57dbd396130009578ca1e7a64246634be4ff3c2868df5a32cfa27b92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B8 3772 bytes
font_01_sfnt_off00006637.bin
a38b5302ada5d95d1dfb64c24956dbf4c2aca9f08b1b282124de90ea83f3e2d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6637 5236 bytes
font_02_sfnt_off000077c7.bin
3bfb7e73b57118ac3ebef705858ca3e8a09f1c81d3f6c056c65f9384e0c0ace3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C7 10436 bytes
font_03_sfnt_off00009ac8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC8 4324 bytes

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