Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd4ac74d2b35544…

MALICIOUS

PDF

35.7 KB Created: 2020-08-11 16:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3949e2c87ed4459a30596b72078cacb4 SHA-1: 35036c4b4de75733260bca9ff69b409797b247c6 SHA-256: 9dd4ac74d2b3554412556a74608f108dc75251066c93a756ec1afdcd4e2b3cc1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=wharton+gerencia+de+tecnolog%25C3%25ADas+emergentes+pdf`. It also exhibits a PDF link farm pattern, with numerous links to PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and other benign-looking PDF links, suggesting a social engineering attempt to direct users to 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=wharton+gerencia+de+tecnolog%25C3%25ADas+emergentes+pdf
    • http://files.joedyton.com/uploads/1/3/0/7/130739593/vavoxikubixolipubego.pdf
    • http://files.bettybivinsedwards.com/uploads/1/3/0/8/130874642/lakikimosuweg.pdf
    • http://files.pythonregius.com/uploads/1/3/1/8/131871874/60843cc09ed27.pdf
    • http://petatej.leawood-pines.com/uploads/1/3/1/6/131606248/6e1009.pdf
    • http://files.glaquaponics.com/uploads/1/3/1/1/131164075/mosevelobiwub_xuwobadalo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/c_programming_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/xefawabitewetem.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/mamusonogodapugujuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5475/0106/files/moligedof.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/virology_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/advantages_and_disadvantages_of_probability_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3171/files/zegapemejenarokakafebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80789229335.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/96679464251.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/rocky2u_admin_loadstring.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0159/files/lodibuk.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_off0000495b.bin
4bd9b8dc2d0ff124ccf2febb47751a01cf9b1600dca6ae8bfbc1a5cfec7de3f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x495B 5636 bytes
font_01_sfnt_off00005c72.bin
2069f25b987649ad712e3a7349c8e0487f8b0a13b7705b036644507d1711c185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C72 10344 bytes

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