Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c8c607a4d66179…

MALICIOUS

PDF

39.0 KB Created: 2020-08-29 20:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc32ae3e4532ad26dfa57940e0768941 SHA-1: 703f736415b280648b726269ba0d70bc7c450786 SHA-256: 23c8c607a4d6617985bc5264624770c07c50b57e6bbc43b23e43923b6b19551f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, it features a link farm of numerous external PDF links, many hosted on Shopify. The primary malicious URL identified is https://ttraff.cc/wix?keyword=pfaff+grand+quilter. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a lure to external content that ultimately leads to malicious infrastructure.

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=pfaff+grand+quilter
    • https://cdn.shopify.com/s/files/1/0436/3413/1104/files/reading_comprehension_test_with_answers_year_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1469/files/87180209236.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/nogaruzasipaberexujobo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/destro_warlock_legion.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/baraton_university_fee_structure.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/audioquest_dragonfly_black_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/95125941125.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/35151061940.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/binary_tree_copy_constructor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4499/files/febuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdf
    • https://static.usrfiles.com/ugd/b8c837_81432d7ddcb1452f9123bbef2aaf12b7.pdf
    • https://static.usrfiles.com/ugd/b58d21_584a224e72174e0fa1bd0ab40351d2dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a0d2140dc5c485c8c0658163308a9da.pdf
    • https://static.usrfiles.com/ugd/67e251_3b152941a08d4597bcf283d981e4d455.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e251f7d0f76426cbe062c9c8a84e4c5.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_off00005aea.bin
4392e10080d8f9776ad81c67bd823c415f9f9d383eef819a561fc61da0a7b149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEA 5024 bytes
font_01_sfnt_off00006bf9.bin
8a84efdfecaca83aecfeb00b615c36dc49a8a048862ed808bf476cacf802bb68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 10164 bytes

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