Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9a72d0c5fafb18…

MALICIOUS

PDF

67.9 KB Created: 2020-08-20 12:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08379c1a50960eddb868d5f397c84165 SHA-1: 3dbb6b9ae9c8b51c570a31b02c0038f0f19b9a80 SHA-256: 1a9a72d0c5fafb18fc6ce72f5f58e1b2ed7ad533839e7828d7270cb7944f1cce
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is used in conjunction with a link farm strategy. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=plant+cell+reports+review' and text related to "Plant cell reports review", suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=plant+cell+reports+review
    • http://files.sassafrassugaringstudio.com/uploads/1/3/1/8/131856907/9909356.pdf
    • http://files.vccburlington.org/uploads/1/3/2/7/132741556/7976703.pdf
    • http://files.goodstuffprimaryresources.com/uploads/1/3/2/7/132712080/xapiga.pdf
    • http://files.naturesjoint.net/uploads/1/3/0/7/130776206/e15dcafed4.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/73906984138.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/livros_auto_estima.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/form_action_route_laravel.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/calculus_graphical_numerical_algebraic_4th_edition_online_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6840/files/download_essential_biology_textbook_for_senior_secondary_school.pdf
    • https://cdn.shopify.com/s/files/1/0433/2093/4558/files/12889181637.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5736/files/brahmastra_advanced_maths_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/88049729518.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/92923763129.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/25168081433.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c21b.bin
b081fe9a7222009ffb256b38b96689a8283a25d53badc19aff1876054c13cc5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC21B 3248 bytes
font_01_sfnt_off0000cdba.bin
2b97e26573e03f28104c028f1939de1abbd8aaab424076107ec8e8fcbaf2f431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 5080 bytes
font_02_sfnt_off0000df1a.bin
e939bfa7045c22a044409e70a1aa569174ed5def2cae94db27b8d312bf528737		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 10256 bytes

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