Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b0411522f84173…

MALICIOUS

PDF

116.9 KB Created: 2020-10-07 03:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b19f0fef136bd2cab340542e4b583685 SHA-1: 567cf119b7535d8b155dfd758c88e3528348219b SHA-256: 86b0411522f84173f36d0a3b3de2853259bfe3f56c941a32050e983a16175eed
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to suspicious or known malicious domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. The presence of a link to 'gettraff.ru' suggests a potential redirector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://gettraff.ru/strik?keyword=critical+care+nursing+a+holistic+approach+10th+edition+pdf In PDF document text
    • http://files.elitestarinspections.com/uploads/1/3/0/7/130775998/jomabor-mefarale-duvira-xukigilab.pdfIn PDF document text
    • http://files.marsta-sigtunabk.com/uploads/1/3/0/9/130969813/9252805.pdfIn PDF document text
    • http://turamov.montessoricreativelearningschool.com/uploads/1/3/1/8/131871781/vobupa_rezirej.pdfIn PDF document text
    • http://gezeki.speedlabtraining.com/uploads/1/3/1/8/131871781/nopesavonaxurab-zofimafusa-sorawegadiwaru-kobatoxas.pdfIn PDF document text
    • http://files.marrajewellery.com/uploads/1/3/0/8/130814118/2238277.pdfIn PDF document text
    • https://site-1036995.mozfiles.com/files/1036995/garobomotezeli.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/peniduj.pdfIn PDF document text
    • https://site-1039895.mozfiles.com/files/1039895/davobotawu.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/ef200d22-1565-49b8-844f-4506a18c58af/jepugiturakazotojubomug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dfdce1-c677-41e6-8316-df220e17c5b1/21518966196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c77691-0dc7-47bb-a171-ebac98251c07/72525225288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15cf9cf4-7435-4968-8dca-aea5506d0299/kamuduxamujawavunuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f2935a-300f-4eeb-86f4-c0105888a866/7715540073.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_off00018f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F08 5516 bytes
SHA-256: 684130c5b1496311770e6de6a0fbef46bbb818a4cd45237a59d77d2b16726553
font_01_sfnt_off0001a1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C3 10376 bytes
SHA-256: c51ef165df50a010e909c5e410f8fcb754fc5336360c382196b13a773f2976af

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