Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b8e02888ac0d98…

MALICIOUS

PDF

46.5 KB Created: 2020-08-04 09:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f44228f66b261a7fdbd833e48fcc424f SHA-1: 4f8069555e421434001c42027f32314b78410b34 SHA-256: 91b8e02888ac0d98c624e44f54bba763dfdc2175c94464aa0d3329ced9a4f6f7
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a redirector service identified as malicious. The document body, though heavily obfuscated, includes the URL 'https://ttraff.cc/pify?keyword=shadowing+let+s+speak+japanese+beginner+to+intermediate+edition+pdf', which is a known malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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=shadowing+let+s+speak+japanese+beginner+to+intermediate+edition+pdf
    • http://files.colonelscup.com/uploads/1/3/0/9/130969986/411935.pdf
    • http://files.amymoenart.com/uploads/1/3/2/7/132740619/7162139.pdf
    • http://files.poetweaver.com/uploads/1/3/2/6/132683267/komixe_xanotuge.pdf
    • http://files.bcmca.org/uploads/1/3/1/6/131636956/wovenaxodidosaruzuso.pdf
    • http://files.barbsbelizeandbeyond.com/uploads/1/3/2/7/132710780/698166b1eaa2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0619/files/9th_class_chemistry_notes_sindh_board.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/tenagumaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/darapuzuvebigeji.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/66131263182.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/24093521944.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/limavemadukiwenasumu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/51330522546.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/cisco_ccie_routing_and_switching_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/tumuzug.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/51196023587.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_off00005d08.bin
82bef9b002f920e122c087fe4e81dde47f7488ee49e7b789e91aff6eaa586d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 7008 bytes
font_01_sfnt_off000074cd.bin
81eb1edcd16d4785d82859dadbb789ad25dc8efa5fee139e2341b0bbea1d7f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 5932 bytes
font_02_sfnt_off000088e5.bin
ba42912e2ad45552362b65799d6f5837c9862f969ea9fbd0a43232c591246395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E5 10188 bytes

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