Malicious PDF — malware analysis report

Static analysis result for SHA-256 18757a7705d5603e…

MALICIOUS

PDF

39.4 KB Created: 2020-08-16 21:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3a61a8a68011b2f7d762d4e11e8722 SHA-1: ec7fc1ef432fd4d454389f9a1ead13041f6c4e16 SHA-256: 18757a7705d5603e3cae977016dbc5727944cb63520dd05a59a1ed76799eea16
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also lures users with remote support tools, suggesting an attempt to gain unauthorized access. The presence of numerous embedded links, many pointing to Shopify, indicates a link farm strategy, likely to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.com/pify?keyword=teamviewer+8+old+version
    • http://files.medaryville.net/uploads/1/3/2/6/132681783/mumazopokuzoz.pdf
    • http://files.brandonrdavis.com/uploads/1/3/1/3/131398533/rukenamereluma-xejubivonuri-resagog.pdf
    • http://files.columbiapresbyterianchurch.com/uploads/1/3/2/6/132680784/b31eff04d2f574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3531/1784/files/37494654230.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/wuwasonopazavup.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/newivobiwizuzomaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/cissp_domain_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/54144269249.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/insertion_sort_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0435/0056/8736/files/17472689518.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6615/files/consonant_phonemes.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/51592668030.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/fetch_post_form_data.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bba.bin
70ff71145c30ce26eb16aff379ede69a14ad0c397e41c5b7ef3cea39e400c50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBA 5264 bytes
font_01_sfnt_off00006d99.bin
6ea2612e53c915596c4489fab47df5ae7c8ed34ee627873fe30f120d8cad43df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D99 10668 bytes

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