Malicious PDF — malware analysis report

Static analysis result for SHA-256 5051c65ce0a17f23…

MALICIOUS

PDF

40.8 KB Created: 2020-09-07 04:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1b709736b5eea0bdf7947536f28940 SHA-1: ee87e7306a0d9fe39b50aa90c54db971f5ed511c SHA-256: 5051c65ce0a17f2349539644f17cfa76745a14586daee159c71a9cfa704f74c9
152 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior through its extensive use of embedded links. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one URL points to known malicious redirector infrastructure, specifically 'https://ttraff.club/wix?keyword=bibliography+apa+format+internet+source'. Additionally, the PDF_SEO_LINK_FARM heuristic reveals a large number of external PDF links, with 'https://static.usrfiles.com/ugd/51c472_8da05b751ee04a678d08b15c995ff644.pdf' being the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains these URLs, suggesting a deliberate attempt to lure users to potentially harmful sites or manipulate search engine rankings.

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.club/wix?keyword=bibliography+apa+format+internet+source
    • https://static.usrfiles.com/ugd/51c472_8da05b751ee04a678d08b15c995ff644.pdf
    • https://static.usrfiles.com/ugd/6a4619_8f364c24d8eb4cf1a5026eeeef83ef0d.pdf
    • https://static.usrfiles.com/ugd/99a8f2_a134a3e5302646c7aad6343a98bdc1b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d7b570e39364345b586ef21a392c2a4.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3176/files/wibebogewofolusedulo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/99516976513.pdf
    • https://cdn.shopify.com/s/files/1/0460/2920/9759/files/akkala_tower_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/xizawopadofonotawedun.pdf
    • https://static.usrfiles.com/ugd/7198c1_629ff62a897e47279acaab4f07895f16.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd30a3165401484da617c59abe85d728.pdf
    • https://static.usrfiles.com/ugd/2b25e8_5b951c056c0144cba3e105fafdd5197a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d11e7ab723e474db2ac34467a97e171.pdf
    • https://static.usrfiles.com/ugd/99afdc_e2e88b41ac0445e4bd482ab82c1b2195.pdf
    • https://static.usrfiles.com/ugd/c836c3_fe2cf73fd5244094b69e5627536cc6ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5d6b7df37384fc9a880e88f05fb19f3.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_off00005f9b.bin
c1ac4b9045765db0660fc07913f97645c0e43937ed4e9e018322044ca9096133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 5720 bytes
font_01_sfnt_off000072f8.bin
e85e7ac00012df9b77eadbba483c563a9769538b47b3b227de4ff775040e5bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F8 11264 bytes

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