Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5914c1668ec446…

MALICIOUS

PDF

45.4 KB Created: 2020-10-04 17:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 192e5203c4847c62bbb431cdf6e35481 SHA-1: 2244434f7533d763a8d06165da55f38606d151c6 SHA-256: bf5914c1668ec44605b1c4d2c9c47ad5767a622fa2db3736ff90575e010dc370
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text related to 'autodesk sketchbook designer tutorial pdf' and includes URLs that appear to be part of a link farm designed to attract search engine traffic. This suggests a phishing or malicious redirection scheme.

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/mozel?keyword=autodesk+sketchbook+designer+tutorial+pdf
    • http://files.scottfostercsu.com/uploads/1/3/1/3/131381464/logipakezulo_vajaloxutime.pdf
    • http://nebemad.bagearoutdoors.com/uploads/1/3/1/3/131398294/sebojad-fojivu-nokusa.pdf
    • http://xakob.fppsofbelair.com/uploads/1/3/2/6/132682110/a9b8dc5.pdf
    • http://files.ernestloh.com/uploads/1/3/1/4/131483025/f26121.pdf
    • http://files.lonestarcarpetcare.com/uploads/1/3/1/4/131437699/zelagebagokosirosa.pdf
    • http://files.pinkchard.com/uploads/1/3/2/6/132681851/38031.pdf
    • http://vixokun.maramare.com/uploads/1/3/1/3/131380582/0802f0ef0eebd.pdf
    • http://xivovum.triplecrownlacrosse.com/uploads/1/3/1/4/131453558/detax.pdf
    • http://voguti.chrisvosters.com/uploads/1/3/2/8/132814742/kusadibabomikuped.pdf
    • http://xeravizod.highpeaks1stgrade.com/uploads/1/3/0/7/130776271/kewerod.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/albers_grits_gluten_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/wordpress_tutorial_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/freytags_pyramid_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6018/9594/files/4_wheel_madness_2.5.pdf
    • https://uploads.strikinglycdn.com/files/a4d33fcb-0f84-4085-abb6-e308c429a8f4/tiritowuxutanugipube.pdf
    • https://uploads.strikinglycdn.com/files/4a2a1bfe-63c9-41b8-b403-ffcaee01d0cf/30396952861.pdf
    • https://uploads.strikinglycdn.com/files/5b8d6fa1-1a5c-4b43-b316-246b2aa3bd90/moragijesoviwezogitaxep.pdf
    • https://uploads.strikinglycdn.com/files/d1e195e3-3ce6-4676-a3bb-5187b099bd49/nupizek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072a9.bin
3d4fc9946f55e9f39ff23ea8efcabea13a1bdaaee63e8bdc16d13678d4d6d1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A9 5612 bytes
font_01_sfnt_off000085ba.bin
f1465e03fe45aa242003bdbe991c9aa4018c49765371956ffa41ec61e4910841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BA 10204 bytes

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