Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf381a46e88f671…

MALICIOUS

PDF

88.8 KB Created: 2020-09-16 14:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1568e6cd49aa2001baae2dca7ba393b6 SHA-1: fe2590ec8232c22733b25c337db8094db29efbff SHA-256: ebf381a46e88f671fd8040b8e283081a3d96545d99bbb3f317e394461a00bd68
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=key+dates+in+roman+period'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external links. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it's the primary lure.

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.link/wix?keyword=key+dates+in+roman+period
    • http://bitigom.bassriverchiropractic.com/uploads/1/3/1/3/131382531/962482f.pdf
    • http://files.baptistegerbier.com/uploads/1/3/2/8/132814241/zikebudok-panoka-naludosazidefe.pdf
    • http://gizinitof.dynamicwealth.ca/uploads/1/3/1/4/131438783/3c52bc60d127d.pdf
    • http://ridivulik.anchoredsoulfit.com/uploads/1/3/2/7/132740415/8397142.pdf
    • http://files.lightenupwithliz.com/uploads/1/3/2/7/132740494/xawij.pdf
    • https://c6eb37bf-d74f-49c1-a24a-daa728b9a62f.filesusr.com/ugd/3be48b_3368fec746934927b75322f137fe3c9d.pdf?index=true
    • https://d05e7124-d5b9-4c6a-8dcd-e6afb68ffb50.filesusr.com/ugd/cc3ca9_9382cab2749f45fd968d2d1890d77b56.pdf?index=true
    • https://8e6322f1-ce9f-4b43-ae6c-8e43d04dba42.filesusr.com/ugd/8c2e83_cf4035166ba2435db8d6c17ecb2e0f11.pdf?index=true
    • https://a79f5f6b-d01b-4ed7-9551-0dbeb575e509.filesusr.com/ugd/24deb6_045ac30af25949fcb7a415e74b7e8588.pdf?index=true
    • https://d15d547a-2908-4e3a-8705-aaea812289d6.filesusr.com/ugd/49f5ef_efb8c2b90bad4f46a06755a56031d2bc.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/0129/8589/files/history_of_ganoderma_lucidum.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/frp_bypass_apk_with_pc.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/pewem.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/certificado_medico_escolar_sep_2020.pdf
    • https://72b311f6-6ad0-4553-8c1a-22ca14bb39eb.filesusr.com/ugd/6cabbb_6def86fad4e9418a88b4392a2ba7b990.pdf?index=true
    • https://ec675336-941a-4909-a858-e8c5d004dad9.filesusr.com/ugd/eb6612_189f02e4c53648caa38571733287d66b.pdf?index=true
    • https://dcca849c-17cc-4a93-8611-a574194ca3d0.filesusr.com/ugd/1cc777_764281f811b04380bb015120ba17cd48.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_off00012124.bin
288aa8c65c3238990e4e2e248515cc65d6ad906bbdeab95483790059745e5d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 5144 bytes
font_01_sfnt_off00013299.bin
9970b6bccc9562c2f6f85ebe9825e88c7880a6be61fcc31f9ef484485463ae4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 10440 bytes

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