Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a794930af29769…

MALICIOUS

PDF

36.6 KB Created: 2020-09-17 12:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1210b2c0ae35cd263fc516ce889a7fa2 SHA-1: 80fd8409e01b94353da58138d6fa6b63960e33f2 SHA-256: 91a794930af29769b09d260346578e9696a8105eb960e26f5c318d0d387e68a3
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.club'. The document body, though heavily obfuscated, contains the same suspicious URL. This indicates the primary purpose is to redirect the user to malicious content or to a link farm designed to host further malicious PDFs. No scripts were extracted, limiting the analysis of direct payload execution.

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=world+history+timeline+chart
    • http://files.hedongreenprint.co.uk/uploads/1/3/1/3/131380767/c5cab39d57ceb2.pdf
    • http://danaruse.keithhowardknox.org/uploads/1/3/0/7/130740164/937a8b.pdf
    • http://nulabexab.westernanimalresources.org/uploads/1/3/2/6/132696063/patoxiwowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/waposubakoguw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/2517749478.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/41515447897.pdf
    • https://640ed0e1-5c31-4c18-9c79-7ddd6ce4a957.filesusr.com/ugd/204f4f_f8830570ed69404aa822ceb75a17b2d4.pdf?index=true
    • https://ce3ce471-fe11-46d2-a710-dc44f7deec48.filesusr.com/ugd/694d5d_67fdc543981b4b94b16ab83a138fc41f.pdf?index=true
    • https://3ae48336-8427-4e34-9433-7bf38452c323.filesusr.com/ugd/685707_9a12b311ed1e4f8a97a31b0b5539de51.pdf?index=true
    • https://df5bb288-4134-4d5d-95d6-8c1858d28206.filesusr.com/ugd/238140_dcc01b19051b456fb29a6797c207ad6e.pdf?index=true
    • https://eb8340e4-fc66-4d65-9e72-8a9ca71a8680.filesusr.com/ugd/738632_74d938e9de3b4f9b85f963caf62fde86.pdf?index=true
    • https://cdd6aa31-158e-446b-9125-991912cf48bf.filesusr.com/ugd/b58d21_9c2f9981edb545b48eeeff798ad5b2e6.pdf?index=true
    • https://86a864f2-a8e7-4853-b393-4085d2d052e8.filesusr.com/ugd/3e7897_bd7b9839f57c4acc9db103a0e41afdfc.pdf?index=true
    • https://4bb03bf3-83dd-4ca2-8ffd-72fe058a8b61.filesusr.com/ugd/3ed902_7a57b8c9488b40cb869d4cd3a51d87b3.pdf?index=true
    • 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_off00005082.bin
74f5395380ab6b66781a7910436b75027a13c50bf9ae13fa888ab5024cd39097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5082 5292 bytes
font_01_sfnt_off00006264.bin
b4c4b66a79e957b05a52f1c5bd35f09f327b7df0a33af60d50be0b0737a1afdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6264 10392 bytes

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