Malicious PDF — malware analysis report

Static analysis result for SHA-256 482aac9216c84fe9…

MALICIOUS

PDF

62.2 KB Created: 2020-08-04 03:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de4e251ec97a34dfa6120342c4f1ac2 SHA-1: 78e51eec0f861fd12a0aa591a77964e11c772784 SHA-256: 482aac9216c84fe9f520a0fce1a62adc733174e99a1a3de3c685c36b900c9d92
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, designed to appear as legitimate content. One critical heuristic identified a link to a known malicious redirector at https://ttraff.ru/pify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=ecocardiografia+transtor%25C3%25A1cica+pdf, suggesting a lure for users searching for specific academic documents.

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.ru/pify?keyword=ecocardiografia+transtor%25C3%25A1cica+pdf
    • http://files.appledentaleducation.com/uploads/1/3/1/4/131406222/pofetenej_xurimilevezo_xefodelegezo_wafabebazezarol.pdf
    • http://zaduro.capricruz.com/uploads/1/3/0/8/130873927/2076831.pdf
    • http://files.mywisdomboard.com/uploads/1/3/2/6/132695575/625417.pdf
    • https://cdn.shopify.com/s/files/1/0450/4974/1464/files/les_affinits_lectives_goethe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/kikoguvuxinekatonixozuvu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/wuludozuzofazetufijozar.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/76796243315.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7365/files/90156358800.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/20096947836.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1324/files/tezewegoratajesijuwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/bizetada.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/taig_9._2._1_jailbreak.pdf
    • https://cdn.shopify.com/s/files/1/0437/3993/8970/files/zuzizajukigilesawakofow.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/87882279092.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/craigslist_org_myrtle_beach.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4807/files/magnavox_zv427mg9_manual.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_off0000ad4a.bin
776470ae2bda62d1f29597c90b0eb1eeebcc06d076ab2635f97ad5eba4dca6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4A 5480 bytes
font_01_sfnt_off0000bf7e.bin
f7d8fcb8ddd79f5f284e5d4e580379118afa8a8b5c66922fa84da9f5b32d70b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7E 13552 bytes

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