Malicious PDF — malware analysis report

Static analysis result for SHA-256 8865cbdffe58d9d7…

MALICIOUS

PDF

51.6 KB Created: 2020-08-31 01:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb2df0ce8072cfa0929111aed0930bb SHA-1: 153e5ade88660d744b93ff1e7ddd198d1392707c SHA-256: 8865cbdffe58d9d79921208df452c4f0c280142e9f6ca9ef6143c182fb5cbdf2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/wix?keyword=monster+hunter+world+gear+guide'. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external resources, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site disguised among other content.

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.cc/wix?keyword=monster+hunter+world+gear+guide
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/29827849076.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/page_break_inside_avoid_mpdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1738/files/minerals_in_thin_section_dexter_perkins_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/boot_full_ubuntu.pdf
    • https://static.usrfiles.com/ugd/0a052f_fc8521f4dabe4f1585c740491fdb99e1.pdf
    • https://static.usrfiles.com/ugd/be19e1_86470005a2a94af9ba0a6fd65227e8cc.pdf
    • https://static.usrfiles.com/ugd/5cf23b_0b299fc280f14595a3c9fce6c0e44c98.pdf
    • https://static.usrfiles.com/ugd/5cf23b_7c4271be0ba24a759435c5f966909b14.pdf
    • https://static.usrfiles.com/ugd/7d21c0_c716b4f75eb74ed1b681819c56a47484.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/kerirugofadim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8830/5575/files/vagasisanuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1846/files/aetna_pharmacy_paper_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/ot_technician_resume.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_62bb79361a374c1dba95200ece1fc648.pdf
    • https://static.usrfiles.com/ugd/7dd30d_6b935b46309248eeb47f41ff64552097.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_3912b01b9cad419f9b6d4513e750156d.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_off00007c4a.bin
aefda0e7d6a3cb23cb231df8c154f21ca14bccba265be74b100c7330a375b56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4A 5184 bytes
font_01_sfnt_off00008df8.bin
00fc09393836fc61d587ebb4a935a8432185850da7ba47d212933e5c08db761a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF8 15952 bytes

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