Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a8c76b8a7c17ed…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 03:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6bf025ebcfae63405a3df121d34cde SHA-1: fdadb0cb5d698ca711db9f1183b3e592a356e264 SHA-256: 28a8c76b8a7c17ed319e86c3fdce6d86d528843ef5a4c4e660ef94b09dbdd0af
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.ru, indicating a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, contains the same lure text and URLs found in the heuristics, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=memorial+day+holiday+closed+sign+template
    • http://folifa.prrofe-olmos.com/uploads/1/3/0/8/130813612/polipisusurukixure.pdf
    • http://pizanuvaw.acesteamworks.com/uploads/1/3/1/6/131636719/5abb614b789.pdf
    • http://lenow.christianlifeupc.com/uploads/1/3/1/4/131454012/kelurafazo_ruloduku.pdf
    • http://files.castlewoodclays.com/uploads/1/3/0/8/130873907/b18a71fa7bc6.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/89944801249.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/tapuzel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/physical_chemistry_adsorption.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/dragon_ball_z_cooler_s_revenge.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/56342824042.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/afinia_studio_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/memugelesexe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/56748841336.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/liverpool_vs_man_city_highlights.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/bofome.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/13816730511.pdf
    • https://cdn.shopify.com/s/files/1/0433/5163/8175/files/wifi_adapter_for_acer_laptop_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000521f.bin
8baf6f61c0b662147e84b62e344034f6d9990f9f88a6157c6c99ba31e3e6c109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x521F 5380 bytes
font_01_sfnt_off0000644b.bin
1f943e98d2f6fa99d17401a52cabeadc8dca90e0e52529a2ac60c5ef77ee343d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644B 9752 bytes
font_02_sfnt_off000085d8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D8 4324 bytes

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