Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedae65a4ad8e0b1…

MALICIOUS

PDF

54.3 KB Created: 2020-08-08 04:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da70394b7c6ce75230e15f08537e904e SHA-1: 3fe82fbf6788d6b676c51bb365c77e7f217ec598 SHA-256: fedae65a4ad8e0b1a255a1360d1b8b530b31c8169b1aed6f4e5e8b96e968497b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=learn+latin+book+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking Shopify URLs, suggesting a lure to external 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.ru/pify?keyword=learn+latin+book+pdf
    • http://zukawurov.adashofclass.com/uploads/1/3/1/4/131453574/3685930.pdf
    • http://files.thinkerslodgehistories.com/uploads/1/3/0/7/130738566/wobijibajefun_dotor_tonirufojutejiz_daxik.pdf
    • http://files.caseyharvilla.com/uploads/1/3/2/7/132712214/vevuzupakaki.pdf
    • http://files.iittlesiz.com/uploads/1/3/0/7/130738614/bedilazusalabox-kipul-vufawutalano.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/warlock_guide_5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/65438272107.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/pazibofe.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/download_adobe_acrobat_reader_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/addition_property_of_equality.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/39988371654.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4650/files/38059732157.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3042/files/mixed_perfect_tenses_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/jobolipawusisodojubowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/jezoloxajakuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/bizetazukubaduxazurul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/tewuzupabisirukepif.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/introduction_to_statistical_machine_learning.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_off00009199.bin
4ebfad44ee60853197cdad52c2f69d0ab63e2e8e0b3d3beb290c34e97bd12607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9199 5004 bytes
font_01_sfnt_off0000a2ab.bin
87407bbc7aec379352bb79a6527142e9ad2b60624e2d1d1ecb955c483b606581		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AB 12264 bytes

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