Malicious PDF — malware analysis report

Static analysis result for SHA-256 640760f4c8c26a10…

MALICIOUS

PDF

51.3 KB Created: 2020-11-01 21:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 38a4328e99337c6e596da9f707b6c516 SHA-1: ea841dc4cf547ace4e737687d1af27a6ceb8ba50 SHA-256: 640760f4c8c26a10ca0511a14bbee5f6c7659b188646a1148735e2a3a033f7e6
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 24 external PDF links, with the primary malicious redirector URL being https://ggtraff.ru/strik?keyword=dcs+flaming+cliffs+3+manual. This indicates an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=dcs+flaming+cliffs+3+manual In PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/3768589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8e5f7733d52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f902fbb20414.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/jevumoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f93c78a822d3.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/tisonanoxurewubanupi.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/1/0266/7819/8464/files/illegal_instruction_4_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4749/0981/files/marinetraffic_ship_positions_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2534/0829/files/vietnamese_egg_roll_recipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/55908700110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9341/5867/files/62103362902.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8927/2737/files/milsim_paintball_loadout.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://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_off0000663b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 4168 bytes
SHA-256: 6a51061fdb348e901082e0563a095912f1e8c4a878f30d7dda856dbb97198022
font_01_sfnt_off00007521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 5268 bytes
SHA-256: c0fd4b09d0f791c8b9e44764c250a0b09884d5fcf485381e01703d405ed01d12
font_02_sfnt_off0000870e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870E 10524 bytes
SHA-256: 48c0b05f727bf4894c4e27ae597737d9ca69d054a8fdbb6bf645a34fa58b62fc
font_03_sfnt_off0000ab52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB52 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa

Open this report in the interactive analyzer, or submit your own file for analysis.