Malicious PDF — malware analysis report

Static analysis result for SHA-256 d984496b5f105151…

MALICIOUS

PDF

49.9 KB Created: 2020-08-01 18:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91efdf15dfb77f10aecd876068124e3 SHA-1: eecbd497e0632325350298b0ddc4684bf3310ed9 SHA-256: d984496b5f10515104ca3f0b908adfa554ae8e24bbf5f2b194a97cddd1d3abf4
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The embedded URL 'https://ttraff.cc/pify?keyword=pimsleur+spanish+pdf' is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery. The document body, though heavily obfuscated, contains references to the Pimsleur Spanish PDF and the wkhtmltopdf tool, suggesting a deceptive content strategy.

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=pimsleur+spanish+pdf
    • http://files.jlsdayton.com/uploads/1/3/0/7/130739062/kusegekopefisazep.pdf
    • http://files.makestudiorva.com/uploads/1/3/2/6/132681359/japiliwave.pdf
    • http://files.belantine.com.au/uploads/1/3/0/7/130739449/6963427.pdf
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/48469089048.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/74524560597.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4366/files/bemef.pdf
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/xanevo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/barikaripugovej.pdf
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/the_last_naruto_the_movie_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/i_don_t_mind_clean.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/beery_vmi_scoring_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/xeran.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/19976660417.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/togite.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/95491009207.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/37801194028.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_off00007b8e.bin
4620824c6f4f83b29760335f961887c33195f421d3571842ede1427732f08d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8E 5280 bytes
font_01_sfnt_off00008d4b.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4B 1800 bytes
font_02_sfnt_off000095d9.bin
245411f88c62f4f8ac24325759fb2e5a1c40f67ae9909eabe5725b9ba5691573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D9 10596 bytes

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