Malicious PDF — malware analysis report

Static analysis result for SHA-256 4480a2ed26625291…

MALICIOUS

PDF

43.3 KB Created: 2020-08-24 16:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c925f8e7b5ee68177e81da3bb1caa68f SHA-1: e40191cc2a7c208751eec689b6dbb8488974ca77 SHA-256: 4480a2ed26625291e9663965dfb73551e5548241c0c1186c7a356cbed6e4b1c9
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for 'j s c result 2018 marksheet', which redirects to a malicious URL. The document also features a link farm pointing to numerous PDF files hosted on various domains, suggesting a broader campaign to distribute malicious content. The ML classifier 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://ttraff.com/pify?keyword=j+s+c+result+2018+marksheet
    • http://files.makesomenoise.online/uploads/1/3/0/7/130740490/xopizapo.pdf
    • http://files.localcraft.net/uploads/1/3/1/0/131071315/jokot.pdf
    • http://nitejaf.photographybysherv.com/uploads/1/3/1/0/131070374/jemadasudo.pdf
    • http://rufomok.reconcilesoftball.com/uploads/1/3/0/9/130969204/xujifu.pdf
    • http://files.ceriscupcakes.co.uk/uploads/1/3/1/4/131407148/robuvikasojoxopewive.pdf
    • https://cdn.shopify.com/s/files/1/0433/7395/3187/files/singer_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6846/5053/files/9221916035.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4780/files/16x2_character_lcd_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/zowulikemigivaziwop.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/kuwefoluvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/83814095000.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/72841201062.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_off000064d8.bin
cf1d36f7c8a1c12ff8b42bfc3415b9ae5734ebe29e5b3f894320f49eeefdb72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D8 5612 bytes
font_01_sfnt_off000077d2.bin
d14b528ccaa52c053defe3ee4e4b84b86b930d652412f0397290000a096e836b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D2 12716 bytes

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