Malicious PDF — malware analysis report

Static analysis result for SHA-256 611bdaac7249d4fa…

MALICIOUS

PDF

38.3 KB Created: 2020-09-12 17:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 841d4b1a4aec92866f81cb0e3cfd2418 SHA-1: 5e02877ec8df34b2ae6c87429da350fe5cfe89f6 SHA-256: 611bdaac7249d4fa6324aba2c238b154ee36becc289eaacf37480116a9a81f4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text related to a movie title and URLs, suggesting a lure to external malicious content. The ML classifier also 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.link/pify?keyword=raghuvaran+b+tech+movie++naa+songs
    • http://xudosaj.boweltolerance.org/uploads/1/3/2/3/132302956/kajejenosoz.pdf
    • http://files.nypdvolleyball.com/uploads/1/3/1/4/131483201/sijobu-bivamow-garonarunetiv-zexivipodo.pdf
    • http://files.darkartsjason.com/uploads/1/3/1/6/131606390/vijafupewo.pdf
    • http://files.thecramm.com/uploads/1/3/1/4/131437619/87511.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7ff653_4b0a673f69ac44329cd71a5082a79684.pdf
    • https://static.usrfiles.com/ugd/ebcc4b_69f928c6ad554f55b0701cfb2a407fb1.pdf
    • https://static.usrfiles.com/ugd/5ad03d_fdeb2f74b75946dcb1be43d9627af48d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d2c8329fb094d4db01d7011dc740726.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6c97b325978480dbf153dd2a6de8c26.pdf
    • https://static.usrfiles.com/ugd/b18e4d_69de3e1c7acf41b2ac1ec774c1f1636d.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_662ea47d9f2a4746a7bfad731d91916b.pdf
    • https://static.usrfiles.com/ugd/286fb8_9a72df7764994c8ea0c611471c2f7dae.pdf
    • https://static.usrfiles.com/ugd/ddb60a_3c1a8b5bbe884960a918671ea0ca084d.pdf
    • https://static.usrfiles.com/ugd/dcbeda_dd897176ebf9454ba87da89c7fd1fbda.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_off00004c52.bin
4960b5851a5ce2ea6f4202da83578d506121e8717cc16f842e3f1b0fcf44edb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C52 5388 bytes
font_01_sfnt_off00005e8b.bin
17b7883c8265c2b799585ec7947ab6729ac1f99f45744282eab77a0b0af6326e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8B 14240 bytes

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