Malicious PDF — malware analysis report

Static analysis result for SHA-256 779efa3edfc0b92f…

MALICIOUS

PDF

52.8 KB Created: 2020-08-08 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df798f971c9dc2c7ec97b1c955d873ae SHA-1: 707a8ec29f4b1f4a5870f42bbc74a9b680ac2f63 SHA-256: 779efa3edfc0b92f1899aa4a30a7d35c74849ee078268a6842f313ed1b191072
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=negritude+philosophy+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is the most significant finding.

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.ru/pify?keyword=negritude+philosophy+pdf
    • http://files.mtdistrictcc.com/uploads/1/3/1/4/131406222/1372901.pdf
    • http://files.jbarcustomdesigns.com/uploads/1/3/1/4/131437056/9012089.pdf
    • http://files.sangerkatz.com/uploads/1/3/0/8/130813364/4443357.pdf
    • http://files.regenerativebusinessinstitute.com/uploads/1/3/0/7/130739625/papasewazetefir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/65038503231.pdf
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/3902282818.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/xirupip.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/ucla_biweekly_payroll_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/7004/4825/files/ps3_controller_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/soxorafemawuvelutuwufekol.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/98072473653.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/prizerebel_hack_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/53912876569.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/52260568630.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/jelosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/lunogig.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008400.bin
c50207f65495f93e93266e63306ef277fee2248ac9352014ca69d0937e3483a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8400 4940 bytes
font_01_sfnt_off000094f5.bin
391ce9c1255f92b995bb9aa36b41ce38f4837950269c79692cf28bd3318609f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F5 10176 bytes
font_02_sfnt_off0000b7d4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 4324 bytes

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