Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4771a7b22614ac9…

MALICIOUS

PDF

39.5 KB Created: 2020-08-23 21:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b354290aa6e01b65e4aced5db04616e3 SHA-1: 7797580290b8414a8ed254bd12300096e6c46169 SHA-256: c4771a7b22614ac984a9a9e942c4af7bed8baaf785f3c26f2d4b9436c3d51389
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string "Os x numbers templates" and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous Shopify links indicates an attempt to disguise the malicious intent within a large number of seemingly benign links.

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.cc/pify?keyword=os+x+numbers+templates
    • http://files.thevincentyee.com/uploads/1/3/0/7/130739190/6014ae081147f2.pdf
    • http://files.freedomdayusa.com/uploads/1/3/1/8/131858287/d5164c0b624a.pdf
    • https://cdn.shopify.com/s/files/1/0437/8532/2658/files/baptist_church_organizational_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/3100/1250/files/knee_arthritis_exercise_program.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/woradevosezonowenasovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/doposibiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/35666264251.pdf
    • https://cdn.shopify.com/s/files/1/0463/3113/4113/files/android_remove_network_may_be_monitored.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/92385731116.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/44811095863.pdf
    • https://cdn.shopify.com/s/files/1/0434/9624/3364/files/craigslist_st_louis_gigs.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/computer_vision_in_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/greek_gods_and_goddesses_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/23544142426.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_off00005e33.bin
0fbe939f51cb89748eaa43163eae992ffa3f4f9ed0feaf67b5ec1040377bfa3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E33 5200 bytes
font_01_sfnt_off00006fbc.bin
8a23ea987a75f3003f709f0396fa8c50a4046e42ec161b8f62a7518a5ed364c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBC 9856 bytes

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