Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b313f3210f70a44…

MALICIOUS

PDF

60.7 KB Created: 2020-08-25 13:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5bb371bc67fa20141ca4fcac38c1e81 SHA-1: a66601fd68c54eb6666082e415730eca0388a608 SHA-256: 4b313f3210f70a444329fff0dba28a4e3f492745f7f1c297153fe3a034f0aab7
160 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=devlin+textbook+biochemistry+pdf', which is a known malicious redirector. Another embedded URL points to 'https://cdn.shopify.com/s/files/1/0432/4337/2699/files/teamviewer_quicksupport_mac.pdf', suggesting a lure for remote support tools. The combination of these elements indicates a social engineering attack aiming to trick the user into downloading potentially malicious software.

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=devlin+textbook+biochemistry+pdf
    • http://files.hotdoghols.co.uk/uploads/1/3/1/6/131637043/707450.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/teamviewer_quicksupport_mac.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/ssa-_3368-_bk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/anatomy_of_human_bones.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/binary_tree_zigzag_level_order_traversal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0206/8131/files/56285254582.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/40685070435.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6990/files/zetuvejagesuzewupirer.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/brochure_tri_fold_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7743/4525/files/19182854792.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/munofesepuvitixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3993/9994/files/classification_of_matter_note_taking_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/sotewagavij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/agile_agile_project_management_kanban_scrum_kaizen.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d52.bin
e97fadabfd6b5b0680cde9a8dfcb408660e5d7bee34605106a2c91c6672b4280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D52 5408 bytes
font_01_sfnt_off00009f95.bin
352b42e5414165801548a2d06c874ecb86e68adcb5ce35511484566fe62b5753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F95 10076 bytes
font_02_sfnt_off0000c241.bin
04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 16112 bytes
font_03_sfnt_off0000d711.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 4324 bytes

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