Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c50c31ce8de640c…

MALICIOUS

PDF

64.7 KB Created: 2020-08-30 18:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc242cd2c86ebc8142f773f1faffa643 SHA-1: dd2bd3033e1f56b4d43354883f62450b3e7cc1fa SHA-256: 3c50c31ce8de640c06aab26ceb3f7243cc0af7e11f5bf68ecd833e8503dbca8e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector (ttraff.com). This suggests a phishing or malware delivery attempt. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable, but the presence of the malicious URL is the primary indicator of 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/wix?keyword=cahier+%25C3%25A9criture+tatonn%25C3%25A9e+gs
    • https://static.usrfiles.com/ugd/b8c837_4d9209eeff2e4894aded3050dffe764c.pdf
    • https://static.usrfiles.com/ugd/0d002d_3b5bd4057a6a4d8b81692c80a764a5df.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28ad10048174f96ad44a077dbc55c73.pdf
    • https://static.usrfiles.com/ugd/b8c837_67e7acd4ca64447d8afb699521dc813a.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/60863501352.pdf
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/sugibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/afraid_to_shoot_strangers_tab.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/befazururogapojema.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/being_there_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3c5f7b5177842d1a8af5e3d7de42d29.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fdf14fbccdf47169eb3b1d1f1c95a63.pdf
    • https://static.usrfiles.com/ugd/b8c837_4888ca9a04c847228ff20eebe8ea2965.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_off0000bad3.bin
fd108ad5af2d34a2cfc4932a424b544ed0d612ce6a2445c973f67b25022461ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD3 5076 bytes
font_01_sfnt_off0000cbcb.bin
33551502c63f713327d415f7eb74bca0ea89ad4384086c9ce81c8afb1d8e5fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 12940 bytes

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