Malicious PDF — malware analysis report

Static analysis result for SHA-256 8691ffbdcaa0a391…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 22:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e102e933957559cf86e45c5d6f92f897 SHA-1: 0121b941334ef30c3ead7c6d0473010a9efaaaba SHA-256: 8691ffbdcaa0a391b982f1b09fb7b230fd0b181a85f3d8c58794622a2f47a54d
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The primary malicious URL identified is 'https://ttraff.me/wix?keyword=infrared+spectroscopy+lab+report+conclusion', which is likely used for phishing or to serve further malicious content. The document body contains garbled text, suggesting it is not intended for human readability but rather as a container for malicious links.

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.me/wix?keyword=infrared+spectroscopy+lab+report+conclusion
    • https://cdn.shopify.com/s/files/1/0463/7392/9115/files/vivebu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/ffxiv_unidentifiable_shell.pdf
    • https://cdn.shopify.com/s/files/1/0440/6388/3429/files/online_editable_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0459/9824/4007/files/fiu_dietetics_and_nutrition_advising_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/office_2019_home_and_business_setup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/romerazefujaxeguziras.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2616/files/66949502883.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/numofiguvilapaz.pdf
    • https://static.usrfiles.com/ugd/b8c837_f93452b4e75f4affa44ca5eb0e7cccdf.pdf
    • https://static.usrfiles.com/ugd/451461_8ffff1acd09448909600daf1fe521981.pdf
    • https://static.usrfiles.com/ugd/07e02c_58ca3f247b494770886c5a3dc56aaa2c.pdf
    • https://static.usrfiles.com/ugd/b58d21_a66f74986e1447f0aa2d799f6f5f8dba.pdf
    • https://static.usrfiles.com/ugd/77941b_6fd334482d874ac3ba2220b1d9b2e1e4.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/52188271485.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/gajamedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/88234740177.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/9599887113.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_off00007135.bin
460a9284682b7d6bb50621e9f8802bd33831e74763dbff65e39d94979a2e0af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7135 5328 bytes
font_01_sfnt_off00008367.bin
b99093d0767b75f56aff692ddf3b9c5cf00842cfb9819def806a43365b765565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8367 9964 bytes

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