Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f09d341e21cf2eb…

MALICIOUS

PDF

53.9 KB Created: 2020-08-10 06:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b99c2b15c7bef56b94203a873776a8 SHA-1: 4d946a491d94e56fdb397a5022b71f2f654b18b7 SHA-256: 2f09d341e21cf2ebe43e08f0b09bb6e881dd57c764343a58d3246321cdde6713
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to ttraff.cc. The document body, though heavily corrupted, contains text related to a 'tanishq gold jewellery designs catalogue', suggesting a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external PDFs, many hosted on Shopify, indicates a sophisticated SEO poisoning or link farm strategy to distribute malicious content.

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/pify?keyword=tanishq+gold+jewellery+designs+catalogue+with+price+pdf
    • http://files.clipsaboutwork.com/uploads/1/3/0/7/130739830/949900.pdf
    • http://files.webelievefoundation.net/uploads/1/3/1/4/131406811/jukadinexiw.pdf
    • http://files.squintingindarkness.com/uploads/1/3/0/7/130775392/ab665.pdf
    • http://files.wakefieldmiddleschoolpta.org/uploads/1/3/0/9/130969206/simalitixirixovogona.pdf
    • https://cdn.shopify.com/s/files/1/0430/7343/7847/files/2020_lok_sabha_election_winner_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/bokivil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/1502217715.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/88248123664.pdf
    • https://cdn.shopify.com/s/files/1/0434/4181/5718/files/automatic_control_systems_benjamin_c._kuo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/nipaluguridedenapivomepon.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3970/files/vofatexadirazimulolituvek.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/74936522436.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/gpg4win_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3765/files/sajudavavuden.pdf
    • https://cdn.shopify.com/s/files/1/0438/7245/2776/files/fedozuraxusidipuvok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/13973432014.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_off000090e6.bin
37d270e80f91da792f2acef648798169c53a27e82794e67176fe06671341d305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E6 5764 bytes
font_01_sfnt_off0000a48c.bin
5ac4f7cb07463e5ca8cc8e22e08783ce32c83bd429dacca41d58539b3abcf7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA48C 11004 bytes

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