Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4b2bdd8317d504…

MALICIOUS

PDF

38.7 KB Created: 2020-10-02 16:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60a0fbe2647b731164e14eea04a9f1dd SHA-1: 5a76e814f2e14abedac3cf9d5b08cc0c9c1f3486 SHA-256: 5c4b2bdd8317d50421a1b31ad29934309a9ce75f3d15a4dc61853086ae907194
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are disguised as legitimate files hosted on Shopify. These links, however, ultimately redirect to a known malicious domain, cctraff.ru. This suggests an attempt to direct users to malicious content or phishing sites. The ML classifier also strongly indicated maliciousness.

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=neo+soul+chord+progressions+reddit In PDF document text
    • http://files.scarfandbow.com/uploads/1/3/0/7/130775192/1126f846a46b.pdfIn PDF document text
    • http://files.southeyeclinic.co.uk/uploads/1/3/1/3/131379874/kiwivizunamilipulot.pdfIn PDF document text
    • http://wuworopiz.drumgownaschool.com/uploads/1/3/1/0/131070401/9353740.pdfIn PDF document text
    • http://vazigomok.mysunshinerides.com/uploads/1/3/0/8/130813668/939769.pdfIn PDF document text
    • http://files.olphartz.com/uploads/1/3/1/6/131606393/gurami.pdfIn PDF document text
    • http://files.jeffreytkendigpc.com/uploads/1/3/0/7/130739924/2297880.pdfIn PDF document text
    • http://files.gallery-lesmemoiresdejacqmotte.com/uploads/1/3/0/9/130969591/2683470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0002/0130/files/walmart_flash_drive_256gb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/need_for_speed_most_wanted_ps3_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0727/7718/files/9505_5136_6206_0022_1643_42.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2905/9992/files/zogomuguduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5097/8458/files/36675722331.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5322/7932/files/85695750217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1714/2433/files/rasufokekojag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9072/3487/files/linear_and_nonlinear_functions_worksheet_kuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3471/8620/files/97463400441.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E33 4976 bytes
SHA-256: 566c53b79da494375ace31497657515d05f884e8b033829b2c2298ac7e17efb4
font_01_sfnt_off00005f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F16 9508 bytes
SHA-256: 4644180378cd3294549513cda37ea77a756472dc3959cf0eddaa230a25d4db9f
font_02_sfnt_off00007fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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