Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c105cf34a1621a…

MALICIOUS

PDF

41.5 KB Created: 2020-08-11 18:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b84b93cb180ba853a534973b0da6bec SHA-1: 21498445ab2b7c79200a67eb4a4130126a430ec2 SHA-256: c8c105cf34a1621aef28e86e4a036364db3082c9ffbbb74e700186711bbe8657
188 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains multiple embedded links, with one critical heuristic identifying a malicious redirector. The document body and heuristics suggest a social engineering lure, specifically prompting the user to install a 'small pdf reader' or similar software, which is a common tactic for malware delivery or credential theft. The presence of a malicious redirector URL indicates an attempt to funnel users to harmful content.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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
  • 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=small+pdf+reader+windows+7
    • http://files.neilbottle.co.uk/uploads/1/3/0/8/130874588/vasuw.pdf
    • http://zagiwoge.targetmarketingmedia.com/uploads/1/3/0/7/130740069/9245913.pdf
    • http://pedoziwu.johnsonfamilypastures.com/uploads/1/3/0/8/130814328/powilofidefefi.pdf
    • http://files.neighborsofsuntree.org/uploads/1/3/0/7/130740252/bopoxovavugibekujapu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/eclipse_rcp_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/wonenesetumosuniv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0246/1351/files/the_talented_mr_ripley_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/26617525446.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/6025297876.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/bekuniwamovo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5586/4213/files/44575589921.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0436/6709/5705/files/rational_combi_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/55262704339.pdf
    • https://cdn.shopify.com/s/files/1/0438/8323/3448/files/wikizorozigi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/8998/files/bubble_sort_algorithm.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_off0000635c.bin
59df9d0fe4205ac22297f087546934be30e4440177bb7907328727627a589af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 5464 bytes
font_01_sfnt_off000075ea.bin
331aa64dd3658ae938d32c56d53b14c90536a68afaddd62d7a3357e5522c06a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EA 10328 bytes

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