Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc665d56b32810a4…

MALICIOUS

PDF

42.8 KB Created: 2020-09-10 05:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c081a10f350fce396e523f09b7215fe8 SHA-1: 8d6330d5e2ad0a8fdf0cf41a523d2d98ccf2a38e SHA-256: dc665d56b32810a418c9e6d78817a3a9cdf19cb673f008b8775acd2dded5696a
150 Risk Score

Malware Insights

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

The PDF contains a deceptive title and a link designed to appear as a legitimate worksheet, but it redirects to a malicious URL. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, strongly suggesting a phishing or malware distribution attempt. No scripts were extracted, so the exact second-stage payload is unknown.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=weather+crossword+puzzle+worksheet+pdf
    • http://files.greeceadventuretrips.com/uploads/1/3/1/4/131407944/51f72b.pdf
    • http://files.keepanopenmind.net/uploads/1/3/0/8/130814642/354913.pdf
    • http://xuvun.emsathletics.ca/uploads/1/3/1/4/131453574/xakasumivevuj.pdf
    • http://pobexe.helpingyourself.net/uploads/1/3/0/7/130739431/7b3b1664dd172ce.pdf
    • http://files.annmcbridedesign.com/uploads/1/3/1/3/131397973/gixokujuvuvape-tibon-mofalolegofi-fulirasisefow.pdf
    • https://static.usrfiles.com/ugd/ac72e0_847bdd8f8fb34b0bbe5c3e0144ad7fc6.pdf
    • https://static.usrfiles.com/ugd/cd79e3_0317c4c7afb64a95898972e87172fb79.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_f2d7f2ebb1534adca3e28c8d78e770c5.pdf
    • https://cdn.shopify.com/s/files/1/0458/2467/1907/files/livizunatunoduvama.pdf
    • https://cdn.shopify.com/s/files/1/0462/9489/2705/files/2791658604.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0876/files/conjunction_and_but_or_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/plant_products_as_antimicrobial_agents.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/vidmate_apk_old_version_4._1286.pdf
    • https://cdn.shopify.com/s/files/1/0431/7639/4901/files/wumobiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3218/0893/files/44165904555.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_off00006711.bin
24cbc958ef22994f61b17c5f5e19fbe854a2ff00bf0ad541a02536269261ff3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6711 5464 bytes
font_01_sfnt_off000079c6.bin
0b254156799eec898320365b6f2d0d520da16fa099d68597b57dfa9749f7669a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C6 10568 bytes

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