Malicious PDF — malware analysis report

Static analysis result for SHA-256 921f84a284e596b6…

MALICIOUS

PDF

39.8 KB Created: 2020-08-01 17:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef257603c2abf93db7fc1eca897b0eac SHA-1: bfc3576e133259fb0187560714fd7893207c7812 SHA-256: 921f84a284e596b6fbec767fa1e8e060cec776cbc5eab963ee4647c67dea7817
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Rads error lol 2016' and includes the malicious URL. The presence of numerous external PDF links hosted on various domains suggests a link farm or SEO manipulation tactic, potentially leading to malicious content or phishing pages.

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=rads+error+lol+2016
    • http://files.dancingwithknes.com/uploads/1/3/1/4/131438228/f8f6a.pdf
    • http://files.newlife-hm.com/uploads/1/3/1/4/131453221/mobiwelej.pdf
    • http://files.jonathanstar.com/uploads/1/3/0/8/130813796/6fb506eef9.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/48926932769.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/5057304553.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/zagijuzomejeva.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/71208616315.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/86666928864.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/4616861290.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/fajisesumilanewebu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/gominegoviwemokub.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6702/files/15390878436.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/labutijebijenabofabova.pdf
    • https://cdn.shopify.com/s/files/1/0440/3901/2502/files/70493463976.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.pdf
    • https://cdn.shopify.com/s/files/1/0441/3584/1944/files/96807553572.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/zepogazumaruberosokuz.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_off00005da3.bin
3237018af1e2673ba4642823ae606ce07e296aaf08334b88cd586f42fc64c0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA3 5304 bytes
font_01_sfnt_off00006fbf.bin
bd4f610f9fae210abb620ce67194638d26373b040ec7a531e8d024d7cefce8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBF 10128 bytes

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