Malicious PDF — malware analysis report

Static analysis result for SHA-256 a915556cf46075b6…

MALICIOUS

PDF

55.1 KB Created: 2020-10-15 00:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d605b8b36b40c5ab1cbdba8235b712c7 SHA-1: f89fdc2c8d67b6d9790934a755b1197071255196 SHA-256: a915556cf46075b68a4517af9fbce69ce3040f19e2d7fc6860776d983008ef43
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Trypanosomiasis in animals pdf' and references to wkhtmltopdf, suggesting a lure for search engine optimization or to distribute malicious content. The high number of external PDF links hosted on disposable domains indicates a link farm tactic, likely to drive traffic to malicious sites or manipulate search engine rankings.

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://cctraff.ru/strik?keyword=trypanosomiasis+in+animals+pdf In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/bomunosawukub.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/welutemavaluli_rinudiladun.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/zodidew.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/kezedivalo-bolumukejufufik.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/miwegewukodemix.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/toripujo.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.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/e9b14412-f090-4d04-b125-0639f9590eaa/movuzirafotoxabeboxuwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58813992-04c2-45ce-a5b5-363fab5c5586/72599397535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f8c069-99d2-43c6-94c9-4e69b4a133c7/wowidewifuxovarisoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/9552/3227/files/5e_bounty_hunter_class.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/when_dinosaurs_roamed_america_soundtrack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4057/1029/files/welirusuletigifut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aab2421-193e-4794-81db-6f89622d1c89/66135647711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b665fc-3ddd-44e5-b95d-e9ae41c8ffc2/71706284115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf38917-35c5-4de4-8cc8-6ed9bfda80dd/55260838386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835b05ba-237f-416d-ac0e-166bd6e1dc05/95781212722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ea54ee-fcec-4260-92c4-1792576da96d/51072115735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345e9af6-9ad5-42f6-8092-b63fd7f4da10/65750341297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6509e6dc-a832-4f00-af04-b2b931147fe6/wekisojudigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0d662c-631f-447c-8ec0-68e8d699a268/46639800761.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_off000094fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FA 5236 bytes
SHA-256: 20d94067d7f355049d53277a7b387c083d04d34283928527c0914e2501de1457
font_01_sfnt_off0000a6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B0 12400 bytes
SHA-256: e2f414d11faab56f40b6a83771c854e51b5c0ede2bd1419fe278b4f5e8d5602b

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