Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f028cd6bc8ee9af…

MALICIOUS

PDF

33.8 KB Created: 2020-10-05 14:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a6fdf8e34d1a76d5ee1ed6ee21efa20 SHA-1: 61c44a8ac84140778b7d7a7fa78343dd4ff97b57 SHA-256: 8f028cd6bc8ee9af376753f89e3e88372a840cace7ae236413e1b8f967f48f84
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable hosting and are designed as a link farm. One of the embedded URLs, 'https://ttraff.me/pify?keyword=bullseye+toy+story+costume', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=bullseye+toy+story+costume In PDF document text
    • http://dokevi.uccbaycity.org/uploads/1/3/1/3/131378898/a95211a0b17e6e2.pdfIn PDF document text
    • http://kufafe.roemhildtreeds.com/uploads/1/3/1/4/131483627/lotaxanoxakotufaxi.pdfIn PDF document text
    • http://files.logcabinwa.org/uploads/1/3/1/4/131407197/2148817.pdfIn PDF document text
    • http://files.scannelllaw.net/uploads/1/3/1/4/131483031/mijudugaredis_vitavoboju_tumesonoxufut.pdfIn PDF document text
    • http://files.poehaku.com/uploads/1/3/1/6/131607239/ab7f23f.pdfIn PDF document text
    • https://site-1036798.mozfiles.com/files/1036798/46585874782.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/zofixafinobiteseliguziz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc48801c-507c-4dfd-82c2-bd8bdff47fc8/wefulifukiwixepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85588a3-1a70-4433-81ca-4de180715ab5/pofozukofipapubin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8f4596-2670-496e-8cdc-c19c63ba7999/25991476719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fc5abe-cc09-4619-996a-a4684e103e4b/50043961754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ee31d0-f652-432f-9b6e-2959b74c34b9/sawaruvewibawawojovasowi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4772 4888 bytes
SHA-256: 9aca7446b37e757da64e32b739ed5821024ec777356df308c2c060617993290d
font_01_sfnt_off00005808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5808 10204 bytes
SHA-256: 9fad22ff2af31ea57f5db5cc6b4aa24ee017a744b98fea8b2fd1a124a5354eb3

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