Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc82836ce4129afc…

MALICIOUS

PDF

42.3 KB Created: 2020-09-12 12:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0efbaee6c0a250d24eed9b7197a82206 SHA-1: f396650dfeb8bb744af24e4713d15a340c7582b4 SHA-256: cc82836ce4129afcb831596d1113c1b7fca745e2349e4244eafff688f0d455b4
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

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.me/pify?keyword=canteen+automation+system+project+report
    • http://files.themudlakeproject.ca/uploads/1/3/0/8/130874612/viwegiduwo-rarodinetesuwom-resejato-dovibulureja.pdf
    • http://kanofuf.uniontownartclub.org/uploads/1/3/0/7/130739974/c38b0dcec15636.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/spotify_cracked_with_function.pdf
    • https://cdn.shopify.com/s/files/1/0434/6694/8773/files/56841877977.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/bekatidedokedoxexen.pdf
    • https://cdn.shopify.com/s/files/1/0437/7831/0306/files/free_printable_delivery_note_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/the_wiz_script_scribd.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/83000749578.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/labadomupulobebi.pdf
    • https://static.usrfiles.com/ugd/98d33d_f8eb0a58cb5a471f9c043345230f9d58.pdf
    • https://static.usrfiles.com/ugd/9b33c5_afd4edb2f6b64e40b6121c86b7a54de0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066fb.bin
75fdcb30afac68a2e47d1c9cd1a98074613be906d8cad6e2cb48d2d7c0679787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FB 5128 bytes
font_01_sfnt_off00007865.bin
7dc3f29a84b6f86ffb648b9f26e8c94aed2a6e0f4125f46439a69f6c80bb7948		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7865 10408 bytes

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