Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37ec28a1666979b…

MALICIOUS

PDF

35.2 KB Created: 2020-08-03 21:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec6bf6e8b82a77a59b43ad0db3c7e07c SHA-1: c6c0dd58aa9fa93e3c0ab7a095bd3c5666f917cb SHA-256: b37ec28a1666979bfd81a98e32c7cacc87ac094cc8071dcac6133c295a8d2231
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of an SEO link farm, with numerous links to external PDFs, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=mathematical+physics+by+hk+dass+pdf+free, which is flagged as malicious. This suggests the PDF's primary purpose is to redirect users to malicious content, potentially for SEO manipulation or to host phishing lures.

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=mathematical+physics+by+hk+dass+pdf+free
    • http://files.projectfine.org/uploads/1/3/1/8/131871477/lejazojaruxiji-sawifa-besururefizuwof-zurawari.pdf
    • http://files.communityfoodsmart.com/uploads/1/3/0/8/130874598/sovaxenijafubosot.pdf
    • http://files.skylightyogafit.com/uploads/1/3/0/7/130775825/1471912.pdf
    • https://cdn.shopify.com/s/files/1/0439/1059/4728/files/firework_animation_gif.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/causes_effects_and_control_measures_of_nuclear_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0436/8649/4361/files/lavufeduri.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/83125889566.pdf
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/graphic_design_cover_letters.pdf
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/37560643803.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/dogipadimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/kesorevudewetekirug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/xefodub.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/tuvosoziseso.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/35894767215.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/81158445570.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5461/files/58586644132.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_off00004935.bin
ebd3e54b4fd2f1b1a00decd6a76ba3af885e635c0b28d33ca2b9a12e2e36f355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4935 5704 bytes
font_01_sfnt_off00005c85.bin
439256228e2dd83661fe9beef3ae8bcfb666f69a693c48390df5b25f531f087e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C85 9892 bytes

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