Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a512b7ab1a78ba5…

MALICIOUS

PDF

42.4 KB Created: 2020-11-08 13:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2a60726e78e59ece142755145179e870 SHA-1: 6269a9ae2f82b9c3d26945e5438f1b74bbb0211b SHA-256: 6a512b7ab1a78ba58e2d66301e0a9c1bd719e00ec6c4dad6f9cb79fcb0dbca92
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains references to game answers and URLs, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of malicious redirector links and a link farm on disposable hosting.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=world+s+hardest+game+answers In PDF document text
    • https://rebabamebuno.weebly.com/uploads/1/3/4/3/134355200/dac2c54f8.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/7378932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5f9f5560772b9.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/soxuzodo_lunapomusotatav_wedumufobunu.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/1e096e798f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5fa482359ef92.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/xasarerajuged.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifesu/article_writing_practice.pdfIn PDF document text
    • https://wirotuxesu.files.wordpress.com/2020/11/8965639901.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000669c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669C 5344 bytes
SHA-256: 8ed5c1302478046ae2ada5c3b4f20ad96669d299b0532ff3772b362dfc60fec3
font_01_sfnt_off000078b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78B1 10628 bytes
SHA-256: e4a3d32493e0df62d208628ac4a32c02abb6343eae7e2980af5aab319e2cf2e6

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