Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d563b7169374b6c…

MALICIOUS

PDF

45.3 KB Created: 2020-08-23 13:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a146fff0bf335ae4c6fb2099e8cd1c9 SHA-1: 4373e29d301fbf1cee88e604d696b91af2907e89 SHA-256: 9d563b7169374b6c6ebb2dcb2188887da5de1188a2905dee3fbc1bf6d3763080
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and a reference to a 'medical fellowship cv template', suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking a malicious link that leads to further compromise.

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.com/pify?keyword=medical+fellowship+cv+template
    • http://files.northernfrightsfestival.com/uploads/1/3/2/6/132682883/3db695d8550.pdf
    • http://files.taofineart.com/uploads/1/3/0/7/130739786/6408290.pdf
    • http://files.millennialstateofmind.com/uploads/1/3/0/7/130775429/ed7e0f.pdf
    • http://files.lisasturm.com/uploads/1/3/1/4/131453924/975156.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/12606679173.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/gogulezelisag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/vegoralodovipisijozutuna.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/63201008771.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/wi_dnr_fishing_report_lake_michigan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1125/files/free_coding_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/dayz_tv_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/bowling_alone_putnam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/pugufujetipigofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/laliwulubapo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3150/8645/files/47740397710.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/python_tutorial_ppt.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000707f.bin
18a90e74b4d0831e472cd4e27c4fdfe40ae77afad11e8343cd2e422905ce3196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707F 5456 bytes
font_01_sfnt_off0000830d.bin
19e555194967b31d93aa729b60d8cdec2db3444921ffd5a0790a838cbe20cdc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830D 10924 bytes

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