Malicious PDF — malware analysis report

Static analysis result for SHA-256 e758a71a0af8f5e4…

MALICIOUS

PDF

43.5 KB Created: 2020-09-17 01:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1c387a2cd5f534f8cbb600edae1e70 SHA-1: b53e264ed302f81ff63310e0ae101a057940329d SHA-256: e758a71a0af8f5e45d409031038ccb49881e2838fb2311a61392235b3e1aaf62
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=phim+bo+han+quoc'. Additionally, the file exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but serve to obscure the malicious one. The ML classifier also strongly flagged this PDF as malicious. The document body contains the malicious URL, suggesting a lure to a malicious site.

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.link/wix?keyword=phim+bo+han+quoc
    • http://files.seesawpig.com/uploads/1/3/2/7/132740541/24d7bbff58.pdf
    • http://files.foodwebfarms.com/uploads/1/3/0/8/130813325/gugatosuxe.pdf
    • http://nemufido.chadnelley.com/uploads/1/3/0/7/130776225/zomusolikabalep.pdf
    • https://cdn.shopify.com/s/files/1/0456/9035/5871/files/transformation_math_worksheets_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0466/8506/1284/files/weather_report_grants_nm.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/download_windows_7_disc_images_iso_files.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/unix_shell_scripting_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/olivier_physical_science_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0440/9124/4696/files/zupelomewofajevokor.pdf
    • https://cdn.shopify.com/s/files/1/0434/2251/5351/files/vilumijunegode.pdf
    • https://cdn.shopify.com/s/files/1/0435/2131/0875/files/gexotupaxilufaful.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/66052900112.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6846/files/42439593324.pdf
    • https://9564af7c-169d-4894-abc5-4ae8c5fe1116.filesusr.com/ugd/594ae5_c8b57f8f5a7a4a18ab58cdb14aa06be9.pdf?index=true
    • https://f008be9d-ff5a-4de7-a70d-624661165c24.filesusr.com/ugd/6cf392_3eaf847de44e42098020310e537a5d2f.pdf?index=true
    • https://b33b1fb6-90e7-4ff9-afb9-c284215923f7.filesusr.com/ugd/cf14a4_3f034d65d2c1485b91317e2c7f393f87.pdf?index=true
    • https://94e57d12-1216-4240-a434-969ecbff4694.filesusr.com/ugd/b4a829_e94656d175e04702b473195bf98d572c.pdf?index=true
    • https://3eff455a-2c6b-4a78-8554-3a92923474cd.filesusr.com/ugd/76156b_700cbbb5e1b34817ab7277fa75d45d35.pdf?index=true
    • 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_off00005f60.bin
a9831edac7fe6a07b0eee279e53ae68f86a12bb6ad54db8792d1422ad2e3e10e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 4684 bytes
font_01_sfnt_off00006f0f.bin
bc7ce683d657cdcfc4d67035d469379192aa4a235db9e1c2ed139eef367ff5f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0F 11000 bytes
font_02_sfnt_off00009302.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9302 4324 bytes

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