Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3faa76dd0c64fe…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 03:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce3cf7d51e9d1ffec9ca6523c34039c1 SHA-1: 596d72d631fbc490619f09225be3ab0c23e2698e SHA-256: fc3faa76dd0c64fe306fd05a18a8b186c4c45de0efba5eea943090ed9513c512
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO poisoning or traffic generation. 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.club/pify?keyword=graphic+organizer+for+writing+an+essay+pdf
    • https://static.usrfiles.com/ugd/ea78e0_7eaf91a36e9840bf8c1cfa1a8b4e835f.pdf
    • https://static.usrfiles.com/ugd/599f1c_b4dd8c9ec675475e8a88998e7c60c568.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1e595c142fe4d1aa22bfba95c315d95.pdf
    • https://static.usrfiles.com/ugd/b8c837_927c2bf494ff478d8ebdfe818e39c2e7.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/nunivubopizitunuvenep.pdf
    • https://cdn.shopify.com/s/files/1/0452/6574/8130/files/class_10_english_literature_reader_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://static.usrfiles.com/ugd/804ff6_63f03088f6214308b5be0ba6269731b2.pdf
    • https://static.usrfiles.com/ugd/83b1b3_a3e56f971a7b4aee9ab35470eb5169c4.pdf
    • https://static.usrfiles.com/ugd/4d6844_ad48ce68b59a4c5d85ca00228853b517.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_off000071a6.bin
8ac157f279bd035db6cbbacc0374e8f01e25e05be1110b46106818b1f30bd7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A6 5660 bytes
font_01_sfnt_off0000850c.bin
89e8fec8c19276d64af52d7452ae47d5ac2ea89901165de44e737440a1024ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850C 10204 bytes

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