Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ffef1f1a1cf0e8…

MALICIOUS

PDF

48.9 KB Created: 2020-11-08 18:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 49538717424b257a18abda374bda478a SHA-1: 82882aa236817cc84cc3f22ee7f6ef456b3ee4be SHA-256: 36ffef1f1a1cf0e8c5dc094ffe065ac148909e9499590d1905db7ccbf579afdb
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains numerous embedded links. One critical heuristic firing indicates it redirects to known malicious infrastructure at 'ggtraff.ru'. The document also functions as a link farm, containing dozens of links to external PDFs, likely for SEO manipulation or to distribute further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?keyword=scoby+kombucha+store In PDF document text
    • https://jiwanozote.weebly.com/uploads/1/3/4/3/134354006/fubajanakujomaz-ramapafetavo-tezakeluza-xinonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5f98ec280250a.pdfIn PDF document text
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/wupesufojiluz_jizatufi_nokexamufebatuz_wezijalil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f87a9137a364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5fa7e942b5d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_5fa80c49c711a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://gonugatak.files.wordpress.com/2020/11/fuwujisovixunokumamabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb4c3c2-3b83-40de-a6fd-516d2d74b3da/eight_notes_crossword.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://lakitov.files.wordpress.com/2020/11/skse64_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb59059f-f425-4672-8dc7-0a827a92a3b0/68457611986.pdfIn PDF document text
    • https://zipexazoti.files.wordpress.com/2020/11/mikolatudod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65f657a-b35b-44fb-8589-07c875bfa6c5/ricochet_kills_2_player_pack.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 5416 bytes
SHA-256: 0651eeaebd59e5337c54f537af25ff623674cb9c569aa423a8fd5c8fd61519ee
font_01_sfnt_off0000711e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000079a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A1 9348 bytes
SHA-256: 2a883bd15b974126a11ca3206821262a96941aee65eb64a8477752a97bb95dcb
font_03_sfnt_off000093b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B4 10268 bytes
SHA-256: 4d1cc6b3a536177305216d610b2c245022b9a29adf6d336bf12bf81a75e64473

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