Malicious PDF — malware analysis report

Static analysis result for SHA-256 50943193664a0e0a…

MALICIOUS

PDF

45.0 KB Created: 2020-10-28 07:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92dcb76f406c304f4698a2304591cfec SHA-1: 7474556511f1ce1c61846955326adc161f908362 SHA-256: 50943193664a0e0a2233b7f68e40331fafe67845388b709adce5c4af353bd1e0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=metric+mania+english+metric+conversions`. The document body, though heavily obfuscated, also contains this URL and other links to PDF files, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://cctraff.ru/strik?keyword=metric+mania+english+metric+conversions
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8c10d0154b4.pdf
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f8c268d829d0.pdf
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f8b575a00509.pdf
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5f95e390e5011.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f87ab13efa5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/pujuduzorivabinifekaputof.pdf
    • https://cdn.shopify.com/s/files/1/0483/3905/8851/files/arbys_menu_and_calories.pdf
    • https://cdn.shopify.com/s/files/1/0435/6436/8021/files/rexusuziborixa.pdf
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/konabenakis.pdf
    • https://cdn.shopify.com/s/files/1/0492/9349/2380/files/36472245367.pdf
    • https://cdn.shopify.com/s/files/1/0501/9618/5249/files/38856490833.pdf
    • https://cdn.shopify.com/s/files/1/0481/0653/7111/files/gebubaf.pdf
    • https://cdn.shopify.com/s/files/1/0268/7421/6625/files/tabla_del_6_hasta_el_12.pdf
    • https://uploads.strikinglycdn.com/files/bab420f6-a0e2-4ef9-aef9-68a8b468a5ce/sepuva.pdf
    • https://uploads.strikinglycdn.com/files/06dae118-2865-4bf8-b854-3814905643e8/43451425421.pdf
    • https://s3.amazonaws.com/wekibik/blow_film_extrusion_process.pdf
    • https://s3.amazonaws.com/vunizi/relative_atomic_mass_of_elements.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006373.bin
6ce1ad7acba38b90ad1f0617206839c5eba69eb302a9a5ac0b793daa33d02e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6373 5064 bytes
font_01_sfnt_off0000747f.bin
c838f662df451bb9d13734523ac9e9321a7312b3c576a1f5ec61d7ecec8b0d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 10664 bytes
font_02_sfnt_off000098c7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C7 4324 bytes

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