Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4820efad71c762…

MALICIOUS

PDF

35.0 KB Created: 2020-08-18 22:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52f4492cc19c361ead29cefb369b00f SHA-1: 21d4ab8b6003263041ffe8bf30ad5c99867b544c SHA-256: 8d4820efad71c7626c6caa7299c18ee87f23a68ab92dead1e86aab88f34151b2
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary malicious URL identified is ttraff.cc, which is used to redirect users to other potentially harmful sites. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for 'Bing maps enterprise platform'. The ML classifier also strongly indicated maliciousness.

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=bing+maps+enterprise+platform
    • http://zejezifu.yukondaffodils.com/uploads/1/3/1/6/131606620/7754df15.pdf
    • http://sexevoz.crotonlibrary.org/uploads/1/3/1/4/131407406/c0c59e8.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/dokazidekupajuveg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0430/8621/7365/files/39920287051.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9839/files/91478626254.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/63528152272.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/dasivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/dujosizixurirogub.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/foundations_of_finance_9th_edition_free.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_off00004cb9.bin
e85e7152e7d0dd5bc7abf5be24aefadb4f12d8345b2a9a76993c1f0d38c8107d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB9 5272 bytes
font_01_sfnt_off00005e89.bin
d275903c4452fdd7af303383dfca735081b9f199b1166f77c6c5ba696252ba71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 9720 bytes

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