Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcf2f3ddfde59c9…

MALICIOUS

PDF

55.1 KB Created: 2020-08-31 20:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 224df43f1d449ae99bf71df0766a272f SHA-1: df23b299ba9a0dea7f05409036212e2454837f86 SHA-256: afcf2f3ddfde59c9f70fb3a3575f46b90adb54ec30c66cda01c56c8667b479c7
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links pointing to other PDF files hosted on Shopify. One of these links, 'https://ttraff.cc/wix?keyword=kant+aufkl%25C3%25A4rung+pdf', is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign, designed to lure users to malicious sites or distribute further malware. 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/wix?keyword=kant+aufkl%25C3%25A4rung+pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/46797703145.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/definitions_of_educational_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/nigipupawarizejilunifu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/ribisogoregesigikogusax.pdf
    • https://static.usrfiles.com/ugd/9cb927_47bc14e05abd4ab28784bd86b9fe2979.pdf
    • https://static.usrfiles.com/ugd/de02f3_d6aa7ed137e64dce801205ffc1d9d53e.pdf
    • https://static.usrfiles.com/ugd/accd1f_65e309964d4d4bc2830389e040b14dce.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/android_developer_studio_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/binary_numbers_arithmetic_operations.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/pawoximukoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/how_do_i_unlock_a_disabled_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/37556381277.pdf
    • https://static.usrfiles.com/ugd/b8c837_abebc3777b5b4a4f8867a1f155e4821f.pdf
    • https://static.usrfiles.com/ugd/4b68be_ee226b6ae8324443b41ed5af3b83f0be.pdf
    • https://static.usrfiles.com/ugd/822ecd_4da9ca59e9cb4b5da84911c176960c73.pdf
    • https://static.usrfiles.com/ugd/ee6770_554aeb53c2a642508cb7c10c01268593.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b87.bin
deaeec8d37e72de38dbe3fa68dc543ee9f618a0075486aa7cd3a8bfbd69a240c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B87 4904 bytes
font_01_sfnt_off00009ba8.bin
1e47d8fe271b46c0ac8c2ce0663c51c7aca1c4dffc7abf2a1e9dd1b41e55ecb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA8 11140 bytes
font_02_sfnt_off0000bfdd.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 4324 bytes

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