Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1186b6d9848b628…

MALICIOUS

PDF

80.3 KB Created: 2020-10-10 11:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 89d7a7b13191dd90b28bfb383cf48757 SHA-1: ef29487e6073a2680e05b7a715c9c0414d21b027 SHA-256: c1186b6d9848b6284a5c4ccab7dd40506c28698a6c220e8150a0029d7fa1a5e1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify and other file-hosting services, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://gettraff.ru/strik?keyword=if+else+statement+java+one+line', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and references to programming concepts, likely to attract clicks.

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://gettraff.ru/strik?keyword=if+else+statement+java+one+line In PDF document text
    • http://files.matakishi.com/uploads/1/3/1/4/131453919/1266797.pdfIn PDF document text
    • http://files.ambigramgreetings.com/uploads/1/3/0/7/130776215/0c8bb.pdfIn PDF document text
    • http://files.tylerleighnicholson.com/uploads/1/3/0/9/130969710/ca0e4.pdfIn PDF document text
    • http://files.soul-sunshine.com/uploads/1/3/0/7/130739971/7572427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5752/0026/files/zazofepukerarononoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/kumaligelobodaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/horde_leveling_guide_50-60.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/art_and_craft_of_mathematical_problem_solving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95fc684-3fa3-4c89-96ca-c60d77b59a9a/gapenijuridesezuwerifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ded77c-ed1a-463b-8c8f-fcd1421c1132/raguxupuzadakitufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88264f50-7dde-4fb7-a64f-ed61845285bc/72463004549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2357000-7702-48f3-bc3d-5d44cd1b5b84/monorokiwolofurafusoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d7b782-ba2e-496d-aa59-351032e0bf9b/59213717807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53499ee4-4fe4-4bc8-bdf6-6093f6ba693c/wubosuzosowuwazepagixenud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022bd794-e1b8-42f9-8003-7dcf8db868b9/41204771484.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 4888 bytes
SHA-256: bc4af40dff75bccf5ffd7ea294ece7c24fa2cbf7f54ac4f84b5b9b0ad7932498
font_01_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 6568 bytes
SHA-256: 11cca4188fc2499bf94f5d9fe27fb7b0091f4834c5e9efb0bb9d58ad7bd673dd
font_02_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 16284 bytes
SHA-256: 6813873bb2c4d0782b2e40503ef970acd2771a5f4a8a9211494b9ad2e6ee8e45
font_03_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16176 bytes
SHA-256: 5d90560c7b16a89c369f6b414f5e51404dee0d7a94590232ca71669273d76027

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