Malicious PDF — malware analysis report

Static analysis result for SHA-256 622740f964d9d5f6…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 09:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a13ce355f06f84ab8a868df0f7706869 SHA-1: e2e12b6bbcee843bb00d508c00caece646a65056 SHA-256: 622740f964d9d5f6eeac0f534a7ad310f4bed897240792f86a1183d8e85324d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=game+mmorpg+free+to+play+android', suggesting a lure to external content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, further supporting the malicious intent of redirecting users.

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=game+mmorpg+free+to+play+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a59130_e77ae12124494b45a14abf3af1b3b9f5.pdf
    • https://static.usrfiles.com/ugd/6f53d7_24ca4938e6c346619ca21f52dc1d1231.pdf
    • https://static.usrfiles.com/ugd/b56239_b7d8ba586112479fb44905d3dc63ea4f.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/accounting_cycle_10_steps.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/kujebiromexenonuru.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4444/files/genevemitamuxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/wot_mods_9._8.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8357/files/65687334463.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/sasuxajelixexeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/72523499672.pdf
    • https://static.usrfiles.com/ugd/99a8f2_8994f7a80367446783e2005da36b1c85.pdf
    • https://static.usrfiles.com/ugd/4dd980_ec69d670cc6f486781b913856f803aa5.pdf
    • https://static.usrfiles.com/ugd/cc03df_7b2ec0adb59b4a209bedb0e702ac74e4.pdf
    • https://static.usrfiles.com/ugd/cd79e3_1bd9b1df69db4e6ca3005ffb31792641.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_off00006152.bin
7896dda973c90eb320f874605b8afc0a2ba126450d2898b02c95ac3bec5120b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 5316 bytes
font_01_sfnt_off00007362.bin
53112a5453922ae15382ccfa635b91eb21c0cc884871ed0be865473d8d410577
pdf-font-stream PDF embedded font (sfnt) at offset 0x7362 9960 bytes