Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e83728ab23af69c…

MALICIOUS

PDF

40.7 KB Created: 2020-08-11 18:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61278363e0a5cc292fb14c908663071 SHA-1: 7ec7cc9ddf56bd69b350c17bb2b1d55613be7e08 SHA-256: 0e83728ab23af69cac899ed2a952c978124111efc34c59dab5bf113ba73cc3af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://ttraff.ru/pify?keyword=cci+behavioural+activation+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, indicating an attempt to disguise malicious activity within a seemingly legitimate document structure. The ML classifier strongly flagged this PDF as malicious.

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=cci+behavioural+activation+pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://files.autonetworktech.com/uploads/1/3/0/7/130738836/feluwijelumek-dexotenib.pdf
    • http://files.carlospenilla.com/uploads/1/3/0/7/130740049/lilus.pdf
    • http://jugomi.dominicksalvatore.com/uploads/1/3/1/0/131070420/5253077.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/l_automatisme_cardiaque.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/saworajoka.pdf
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/dibogup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8673/3727/files/peter_f_drucker_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/kefujin.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/podifoj.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/nulimireseresovebiveser.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/astm_e8_e8m_16a.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/nevelitonununifezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62386903812.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/mupepefalawabuwata.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_off00006383.bin
8bec9fdbbd45fc2d97b4daa03709d6f3666b56c7ebafd9bc8add43b9b116f9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 5168 bytes
font_01_sfnt_off00007506.bin
a941e7fc52f7d21fbebfc10d7a637d72ecd2c1036eac177ab61a02d120b6b451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7506 9640 bytes

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