Malicious PDF — malware analysis report

Static analysis result for SHA-256 3419bc1a7cfa602c…

MALICIOUS

PDF

40.3 KB Created: 2020-08-05 17:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bbe8953309657090526f391a93b3c6f SHA-1: c7d7185df4f1f82f6436d1d3f59390ddcdb18a6e SHA-256: 3419bc1a7cfa602cd70bd147c36814ba303a5cccc463cc05979e1777aa5f6b99
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.cc/pify?keyword=mobile+ad+hoc+networks+in+mobile+computing+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the same topic and the malicious redirector 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.cc/pify?keyword=mobile+ad+hoc+networks+in+mobile+computing+pdf
    • http://files.itsyourlifeyourway.com/uploads/1/3/0/8/130815095/nepumivezawipazadip.pdf
    • http://files.crustycap.com/uploads/1/3/0/7/130775350/gumawebek.pdf
    • http://files.thescratchlist.com/uploads/1/3/1/4/131406258/1525378.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/23747249824.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/51128924466.pdf
    • https://cdn.shopify.com/s/files/1/0437/6946/2935/files/nicet_level_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/john_deere_425_parts.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/36726711640.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/89524996648.pdf
    • https://cdn.shopify.com/s/files/1/0437/6012/4065/files/fokezaxazudoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/82487988687.pdf
    • https://cdn.shopify.com/s/files/1/0436/8406/9526/files/lirifepavodes.pdf
    • https://cdn.shopify.com/s/files/1/0435/3556/4949/files/dezupapinolunotesi.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_off00005db6.bin
5a6b1ab8e34af2322b46f02bbfeeaddf0af0e7b0bfb55b9cc2ab7abf5b5fa97b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB6 5872 bytes
font_01_sfnt_off000071a2.bin
3228f7a9e080ce6bbf3399b5a6e781738d7cd9e60427fd6e9feb800b80f7015d
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A2 10200 bytes