Malicious PDF — malware analysis report

Static analysis result for SHA-256 13307f9225ff3738…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 08:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ec580778d9680f66d3121ec8c8c38e SHA-1: 55b48a5f452d650274b377e83ec31ac6dcdc1ba7 SHA-256: 13307f9225ff3738120cb75fcc7829da86ac02013ae2d5f53a4acd6fac160f4c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many pointing to external PDF documents, which is indicative of a link farm. One of the primary links, 'https://ttraff.cc/wix?keyword=call+of+cthulhu+grand+grimoire+pdf', is flagged as a malicious redirector. This suggests the document is designed to lead users to potentially harmful content or to manipulate search engine rankings. The ML classifier also strongly indicated maliciousness.

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=call+of+cthulhu+grand+grimoire+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/12f4eb_c5610472bc0948468bddde7816b0e104.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c266b54b4b447ba8891eae0752843d8.pdf
    • https://static.usrfiles.com/ugd/10b11f_08973d10931240c5948b82be1e20abb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c02035af460e4bfc92c6e51eb577c4a0.pdf
    • https://static.usrfiles.com/ugd/1a89c8_d979326f6e99496cae55d54658e3eb49.pdf
    • https://static.usrfiles.com/ugd/77941b_c3d9dda8a61044438e357144eb193d35.pdf
    • https://static.usrfiles.com/ugd/b8c837_e21ebc83e53545c0992db7a8490f7f50.pdf
    • https://static.usrfiles.com/ugd/b98abb_703052971ab042b0a76b23bb62a20d3e.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_ca43ba5b771b4ed3ad01d8e76bd96b83.pdf
    • https://static.usrfiles.com/ugd/b47706_47904a46d11b407cbb3382d0815a952d.pdf
    • https://static.usrfiles.com/ugd/e5a943_197441899a964a58afdc049ab3f24826.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9c578f1fca946be8a8148f259330973.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/evinrude_48_spl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/dialysis_unit_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/27454341017.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/orthographic_projection_exercise_9_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e6e.bin
752bcfe1c3345b24b0413955330a71a2b115fae03a5b98551e7b885e2a52c4d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6E 5296 bytes
font_01_sfnt_off00006040.bin
b0394ac2733e2da22385f2fbf6ae7c525eb4d758c4cff81707c2d6640c397990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6040 9776 bytes
font_02_sfnt_off000081be.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 4324 bytes

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