Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cc434db5f80cb7…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 22:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc19dcceb094f5a1b0b8d7d4eb826e4 SHA-1: c9b3d5af1819fffe88ba3a58c6bb0ac66a1242fa SHA-256: 00cc434db5f80cb7b75821296d2d03c9506914222c475b6912e254d13993c597
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are to benign Shopify URLs but at least one points to potentially malicious infrastructure. The presence of a 'download button' heuristic further supports a lure-based attack pattern. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=baixar+arquivo+pdf+iphone
    • http://files.the8blockfitnessstudio.com/uploads/1/3/1/6/131606674/1f565bc5183d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/netimipiguvug.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/brief_introduction_of_samsung_company.pdf
    • https://cdn.shopify.com/s/files/1/0436/7345/2697/files/angular_2_size.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/89663944428.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/8035569362.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/97024072621.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/nenojajuratukole.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/bangladesh_government_holiday_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1562/files/21618224031.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_off00005a03.bin
62e1577258efed17fddd1f560852cc1da1f73e63f5ca4b17a55bea1f0e04d07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A03 5220 bytes
font_01_sfnt_off00006bcc.bin
c91a54657eacc22c974f548822e508f1f455a25a965620e09ae5762f1b6dada1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 10008 bytes
font_02_sfnt_off00008e37.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E37 16312 bytes

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