Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c77d8b61ebf079a…

MALICIOUS

PDF

33.3 KB Created: 2020-04-02 00:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 18534e6fceb412a6b62d0373c3810925 SHA-1: 2951678f745a457b35e926b5b38ea091375e02d4 SHA-256: 4c77d8b61ebf079aa35831f3898bdde6c5942230aa248d4a0bba859d9c59188c
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as a link farm designed to improve search engine rankings. The document body text, though heavily obfuscated, contains a reference to 'Faded remix mp3 download' and a URL, suggesting a lure to a potentially malicious website. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://chiksnightout.us/uploads/1/3/0/6/130605422/130605422.html#faded+remix+mp3+download
    • http://hyepie.com/uploads/1/3/0/6/130604501/baveforutew.pdf
    • http://erinleannegray.com/uploads/1/3/0/5/130590143/2770648.pdf
    • http://texas5kbeerseries.com/uploads/1/3/0/2/130272234/4ffadd9.pdf
    • http://terranovasa.net/uploads/1/3/0/7/130738799/8487738.pdf
    • http://donbulfertutoring.com/uploads/1/3/0/7/130740625/7801109.pdf
    • http://limeandthyme.com/uploads/1/3/0/5/130543976/wulebuxefakek_tinur_xabiseruwexoxav.pdf
    • http://tarakirina.com/uploads/1/3/0/6/130621707/54b06c25e772.pdf
    • http://cantelmedicals.com/uploads/1/3/0/5/130551726/41978f55a5.pdf
    • http://kingbyfriday.com/uploads/1/3/0/7/130740338/6649856.pdf
    • http://thursdayrome.com/uploads/1/3/0/5/130588540/6e858.pdf
    • http://royalpetservice.ca/uploads/1/3/0/9/130969146/5b4728da.pdf
    • http://sucsasaya.com/uploads/1/3/0/6/130621852/xifelazuwefa.pdf
    • http://frankescalet.com/uploads/1/3/0/6/130604196/tubusobibuxo.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_off000050f6.bin
43e16bcf03d93d0b8ac8f6ad65c62d5d78b74b1baf8f922dcb6c1d14fe6a75af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F6 6456 bytes
font_01_sfnt_off00006ac3.bin
eaa4dde51fd04d4db8dc223d97e5e1aeb2070941b7c144db1acc557f645d9ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC3 4184 bytes

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