Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca45e5d06b4844c…

MALICIOUS

PDF

61.2 KB Created: 2020-11-09 01:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba1bf365b36c454cdf6adff902fe86f SHA-1: be67ceaf0a1060cecd44e9c54809c5f73040cb62 SHA-256: 3ca45e5d06b4844caba40248cba8f1c0fee991b44f9be7b695824b3428297bf0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the observed malicious link patterns, suggesting a phishing or malware distribution attempt.

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/123?keyword=subjective+relativism+examples
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/tulamudalof_bujodalomol.pdf
    • https://kepelawurolunuz.weebly.com/uploads/1/3/4/0/134017158/ebe4cc792597c6.pdf
    • https://niviraxaxupo.weebly.com/uploads/1/3/4/4/134469592/1247290.pdf
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/1163193.pdf
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5fa776cdcd897.pdf
    • https://cdn-cms.f-static.net/uploads/4384308/normal_5f974d803124d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b4ae2f06-10bd-4e90-bdf9-5d4ed6119b59/34135895248.pdf
    • https://uploads.strikinglycdn.com/files/82775bab-0e5f-46e8-b9cd-0ae92321619d/the_necromancers_manual.pdf
    • https://uploads.strikinglycdn.com/files/11b5b359-099b-4d90-9dff-742de0d1c9d5/acute_and_chronic_gastritis.pdf
    • https://puforevux.files.wordpress.com/2020/11/apne_movie_watch_online.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09f.bin
94f81f9aa5b3e79329f00da5f23b080908acac13022aab5d7038fe70d7401980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 5524 bytes
font_01_sfnt_off0000c35c.bin
4138334e9d2f412e1ff7bbcc96339d33e08ed9eebfb2ff95955529c44cd14460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 10784 bytes

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