Malicious PDF — malware analysis report

Static analysis result for SHA-256 24af389f22ae7233…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 01:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd66846ea1d03f6b5a6b7b73cad98458 SHA-1: 6667cde622e97e218e33eccecab53f609bdffb87 SHA-256: 24af389f22ae723313753d45298b77fe60514c6dd7821767e1dc0da0f3b7adbc
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc'. Another heuristic identifies a large 'PDF link farm' with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The document body contains the redirector URL and several Shopify URLs, confirming their presence within the file's content.

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/wix?keyword=cam+bay+thuong+truong
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/favorijevigevivarexoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/mabesuzerumulami.pdf
    • https://cdn.shopify.com/s/files/1/0463/0862/2493/files/miropazutowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/tulibomovabivowabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1092/files/koxate.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7831/files/75964775184.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/33788385506.pdf
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/evolution_evolutionary_arms_race_video_questions_answers.pdf
    • https://static.usrfiles.com/ugd/05900a_2089584c2572457a92dd065fc99af260.pdf
    • https://static.usrfiles.com/ugd/ea78e0_550878a1594e47af9ba89d8e0a9fc5b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e3139bcce8430f922dac828fd2f76d.pdf
    • https://static.usrfiles.com/ugd/4d6844_07410951a8f84816a0070be71fbff849.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_553c3589f1f642b598b7979d326d7d3c.pdf
    • https://static.usrfiles.com/ugd/4ae4db_9a751a7425154c69b8ffcaba32e61251.pdf
    • https://static.usrfiles.com/ugd/48d9a1_cb6d4ce64f8d4468b02280405f4f99c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a91bce7aa46a49479a868f6e3fa68656.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_off00005e09.bin
d6a39def176e15212310c9a3cfd91d2be05c8c1595b200bd967d267bb3ea0f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E09 5036 bytes
font_01_sfnt_off00006f11.bin
56fd46c430d7a21c50d5dd80bcc1710daa1936c5bf275c7235275127f23fbdc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F11 13692 bytes

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