Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa15bc809c5fa39b…

MALICIOUS

PDF

67.9 KB Created: 2020-08-10 21:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba35d4d3154e98fca71388dbe28be4a SHA-1: 259a4f27972d2177be66e513caeee6e5e6f444e3 SHA-256: aa15bc809c5fa39bd6fc638898a414e4c1126ed839680b7fa74e418e3b13cd37
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=pdf+antropologia+biblica'. Additionally, a PDF link farm heuristic indicates the presence of numerous external links, with 'https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82973104521.pdf' being the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

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=pdf+antropologia+biblica
    • http://files.ruanlanihorneparishcouncil.org/uploads/1/3/0/7/130776065/cd0c0648c83.pdf
    • http://files.tapcater.com/uploads/1/3/2/6/132695568/wotewonebumux.pdf
    • http://files.somaticsoundtherapeutics.com/uploads/1/3/2/3/132303270/92598062e64f0.pdf
    • http://files.michaelcmarshall.com/uploads/1/3/1/6/131637137/4014108.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82973104521.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/91592973420.pdf
    • https://cdn.shopify.com/s/files/1/0447/6433/2181/files/charlotte_s_web_e._b._white.pdf
    • https://cdn.shopify.com/s/files/1/0435/2838/8767/files/facebook_group_cover_size.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/human_body_systems_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3111/files/basuwerer.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/bais_yaakov_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/rekidotanuwavo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/ranutimirofejavaler.pdf
    • https://cdn.shopify.com/s/files/1/0455/3559/2613/files/beehive_class_9_chapter_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/65612962589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/lojavuwokoliwamoji.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_off0000c888.bin
edfdfe86d7ee22cde75528f7b5eee6666cdcc3007b0b330e5700b195cc655c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 5284 bytes
font_01_sfnt_off0000da85.bin
115d8e0e9546fe80f01de9fe899bb5c9bed6cff62d81eb41e8fe7748e9560dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 12560 bytes

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