Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f792f30da1880d8…

MALICIOUS

PDF

71.8 KB Created: 2020-11-25 01:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49509075d8c83e7b6ab96d091f84c77c SHA-1: 5ef8e926f6b90622df5f3f66ca23945e6af9dd25 SHA-256: 3f792f30da1880d85b868208f12882e2c041ff9231d1f2209ef1c3f4d009c98e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The primary URL points to a redirector likely used to distribute malware or lead users to phishing sites. The document body, though heavily obfuscated, contains strings related to 'Marvel strike force apk mod 2019', suggesting a lure for potentially pirated or modified software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=marvel+strike+force+apk+mod+2019
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/segeturorekegajaga.pdf
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f9da8981dee8.pdf
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fb68e4a67d61.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/bukuzopuzir-mikuxerojaweta-dapudokurogova-kowalime.pdf
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fa46ab095c6f.pdf
    • https://cdn-cms.f-static.net/uploads/4491705/normal_5fb8f2fe10e3c.pdf
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/gutomavenavuj_vimugokej.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fa8c301aa7cd.pdf
    • https://cdn-cms.f-static.net/uploads/4464700/normal_5fa571ca2fa51.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f97ee0b19777.pdf
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fb3c9612762f.pdf
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/7086893.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5f89c185b6d94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/napejaxosinages/unified_remote_modded_apk.pdf
    • https://s3.amazonaws.com/jipowumat/tuwigefi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdac.bin
07766be49451700a9d61b9f80ee669ae9319b8a647c8261c5257662b295d77e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 5596 bytes
font_01_sfnt_off0000e0c9.bin
fedced7d7bcd030704e47fda99b3247261c2e5bc098c05b16399f0234d2e8371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 10224 bytes
font_02_sfnt_off00010387.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 4324 bytes

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