Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe194d96a726cef…

MALICIOUS

PDF

47.3 KB Created: 2020-08-24 23:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca068d73f082185f558646591b50d830 SHA-1: c2a66d59761d7d5230cc9923eb70f2cb58381b74 SHA-256: 7fe194d96a726cef35bebdf3ec993d5e064c3802ba3ac212f828e539c1ee9881
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a patient handout, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and it includes a lure to install a browser extension or update, further indicating a malicious workflow. The embedded URL `https://ttraff.cc/pify?keyword=low+back+pain+exercises+patient+handout+pdf` is a critical indicator of malicious redirection.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=low+back+pain+exercises+patient+handout+pdf
    • http://vakoduma.micahmakespots.com/uploads/1/3/1/8/131857120/9cb72.pdf
    • http://files.cwwdelta.com/uploads/1/3/1/6/131637163/50e16528845f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/33649310055.pdf
    • https://cdn.shopify.com/s/files/1/0450/8450/8325/files/public_health_policy_formulation.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/madotipewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/fumarulofuweragur.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/payroll_accounting_journal_entries.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/rufulapogilomesujujot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/graves_guide_8._13.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/67211733254.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_off00006c44.bin
937ddd95c868cf11b25450733fa252bae450a4a8cd156756f50049a476de7fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C44 5396 bytes
font_01_sfnt_off00007ea1.bin
02f5749d69d40ea2689459abb2aed01b108a0b5878963ca78c67875f79adc8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 10456 bytes
font_02_sfnt_off0000a223.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA223 4324 bytes

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