Malicious PDF — malware analysis report

Static analysis result for SHA-256 723dffe24f6f2e23…

MALICIOUS

PDF

40.7 KB Created: 2020-08-18 20:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29c1b0d80dfe2c7dd437bbc31e00a56d SHA-1: fb4bb4998953c7807428719454fd57e48d024b68 SHA-256: 723dffe24f6f2e23d55917d8ce3bb6c4c05f4a9e8fdbea231bef9c39acedecc3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to potentially malicious redirectors or SEO link farms, suggesting a phishing or spamming campaign. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of the URL 'https://ttraff.ru/pify?keyword=unit+2+electron+configuration+puzzle+worksheet+answers' indicate a redirection to malicious infrastructure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests an attempt to trick the user into executing commands, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=unit+2+electron+configuration+puzzle+worksheet+answers
    • http://nirufixof.sugarandseeds.com/uploads/1/3/0/8/130814575/3976991.pdf
    • http://files.wswatermark.com/uploads/1/3/1/6/131606819/mugomi.pdf
    • http://wokiza.blayneylfh.org/uploads/1/3/1/1/131164048/83f6bd3335e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/krishna_bhagwan_photo_image.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/anemia_cacing_tambang.pdf
    • https://cdn.shopify.com/s/files/1/0447/2664/8985/files/stay_hungry_stay_foolish_online_reading.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/printable_paper_cutting_art_templates.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/nfl_pick_em_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/conjugate_gradient_method.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/copy_file_terminal_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/biochemistry_by_donald_voet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/gixulakofimizobotakex.pdf
    • https://cdn.shopify.com/s/files/1/0434/2179/4460/files/24878734781.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/41657959792.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/31431402133.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0437/2614/3639/files/94291595384.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006055.bin
5f4ea109eb20edeeab7e5b2c25e880616d5bcf9b5356aa0f068def2a0635d4a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6055 5604 bytes
font_01_sfnt_off0000737f.bin
8eeb0bbc82d846c761e97861bb5c7f192dbf329c573e4162e99900d55c924bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737F 9928 bytes

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