Malicious PDF — malware analysis report

Static analysis result for SHA-256 df74da7c81852a6b…

MALICIOUS

PDF

38.1 KB Created: 2020-09-16 21:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b10e071b787f12871baf55f4031d25 SHA-1: 3911f62d2d7c8c47d15f5b1449cd90adac470ece SHA-256: df74da7c81852a6bb952e60e195abe78e2fb441e3d441a5ac35e48fee9290dbd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm, directing users to various domains. One prominent link, 'https://ttraff.me/wix?keyword=gunblood+cheat+codes+for+shotgun', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains similar URLs, reinforcing the attack pattern.

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.me/wix?keyword=gunblood+cheat+codes+for+shotgun
    • http://bavibisu.seaofqibodywork.com/uploads/1/3/1/4/131412290/bunoridevokinimefa.pdf
    • http://lekerizim.foundersparkhighlands.org/uploads/1/3/1/4/131406841/xofavade.pdf
    • http://kevifudo.kdrecording.com/uploads/1/3/1/4/131406202/wezoburipinov.pdf
    • http://befovu.dralisonpt.com/uploads/1/3/1/4/131406352/4de741ef8.pdf
    • http://fifeb.bridgetbuildscharacter.com/uploads/1/3/2/7/132740249/93fe207e5a.pdf
    • http://pijax.healthydentistrysolutions.com/uploads/1/3/1/0/131069899/kesekowadir_lulenesaxeke.pdf
    • http://files.wonderpupspetcare.com/uploads/1/3/1/4/131483361/sigaxit_wonolirofaj_tunaxisobiva.pdf
    • https://96948ab6-ce57-49cf-aa4a-ea6d3ef1a8dd.filesusr.com/ugd/33a16d_1c1302f2c8d5405bbcb95698e6a386f0.pdf?index=true
    • https://80c73fdf-e194-42d8-b2ca-f830b9fecee9.filesusr.com/ugd/c5d40f_017abec0bd7f4af8bc71ca29d5b9b5e2.pdf?index=true
    • https://1648e839-c866-4441-9658-ed2b79d45a2e.filesusr.com/ugd/0c60a0_82f0452461ae460ab3b82d9349f8ec58.pdf?index=true
    • https://1cbf2bd2-18e1-4ae4-ba62-a5abc8826bd7.filesusr.com/ugd/44b221_e6640da9f8704c3b83c7d82c8d052dff.pdf?index=true
    • https://e138f13e-b122-409f-abd2-697b5313841c.filesusr.com/ugd/0bcf16_5fe2f1bd9b0a42b18cdd375dd1109150.pdf?index=true
    • https://b5b3e5c8-5807-4c85-8f27-8b7d0e237dac.filesusr.com/ugd/0b46e6_fad31ae4cc0142ae94257b70600cef2c.pdf?index=true
    • https://a69e09e5-c794-4c77-b660-8d7146fb80ab.filesusr.com/ugd/120874_2b8d8b9751284a97a425dfe9e393993b.pdf?index=true
    • 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_off000055df.bin
45c45454c888ea7eeb92af42eee407d251a6e3dac0fcfa6e8f4f24d4324cbbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55DF 5456 bytes
font_01_sfnt_off00006860.bin
1756e35ddb9dc8c0295ac600326ef46cdd870db6ffb676b9b1be3db9e4a104cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6860 10288 bytes

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