Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c6ac09264df26c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 22:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc2292ae0e7c0cd98d15c026a60a1230 SHA-1: 3de470e4c44aa8e35ebd12fe1c57d7116d26eb21 SHA-256: 67c6ac09264df26cd14c34da8b033edf50b8030e098feda9b655d5168479c9db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.cc/pify?keyword=tipos+de+arboles+de+decision+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to potentially harmful 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.cc/pify?keyword=tipos+de+arboles+de+decision+pdf
    • http://files.arinsberg.com/uploads/1/3/1/4/131406391/kolagozutemabulod.pdf
    • http://files.almachurchofchrist.com/uploads/1/3/1/4/131438313/4300784.pdf
    • http://files.floralgreenspublishing.com/uploads/1/3/1/8/131871938/2924766.pdf
    • http://files.localsonlychattanooga.com/uploads/1/3/1/8/131872178/9244855.pdf
    • http://files.allergicandyummy.com/uploads/1/3/2/7/132740978/mejuzovuwuraje-jasigaluzu-kivagifip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/reduced_adverb_clauses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/66123410462.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/certificat_de_cession_de_vhicule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/27739459319.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/xulevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6465/6026/files/return_man_3_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/11843408117.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5877/files/gawotexeraxobomaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/xorupedinivorilezoxominiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/rifubimifubitofaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/17265661661.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/reet_english_teaching_methods.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ed.bin
352decd51ba146922571361cae3032945d2817c66dd7e4685114398bb9a69526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 5236 bytes
font_01_sfnt_off000073c0.bin
203c9c3ff6c9978ed5a3b4e1734d63bc9fb42d10cccd0c1025d8a86e5caf60ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C0 11780 bytes

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