Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f38aba5adfd732…

MALICIOUS

PDF

39.3 KB Created: 2020-04-26 21:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2faa3f80b8201e014213e3f55b49c57a SHA-1: 5dedb3f6106f68928e63a28151280ae99c35ece4 SHA-256: 90f38aba5adfd73293e75dd304b81e1b9f429b873960f32bbd13e7a2faefd291
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to SEO-optimized PDF files on various domains. One of the embedded URLs, 'http://rem5chicago.com/uploads/1/3/0/5/130551310/130551310.html#film+boneka+chucky+2017+sub+indo', suggests a lure to content related to a movie. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the extensive link farm points to a potential SEO poisoning or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://rem5chicago.com/uploads/1/3/0/5/130551310/130551310.html#film+boneka+chucky+2017+sub+indo
    • http://greencanopycustom.com/uploads/1/3/0/2/130289270/72d210d.pdf
    • http://colonialriverfinancial.com/uploads/1/3/0/8/130874285/zalagikidisizup.pdf
    • http://resonaisearch.com/uploads/1/3/0/4/130477192/zadepe_tafonoremiri_guzoso_jesupuporiburus.pdf
    • http://sfsparkscheerleading.com/uploads/1/3/0/3/130323811/zesufogoji-lelonidobafekun-xakivajat.pdf
    • http://amyevansbauer.com/uploads/1/3/1/3/131380433/4897669.pdf
    • http://dennispoolcare.com/uploads/1/3/0/4/130435546/vatosufomazezalu.pdf
    • http://rootsdesignco.com/uploads/1/3/1/1/131163902/1219652.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007175.bin
678adadef5e14821d70e754a5a9c58c3491d4c317d37106ba246b601588f737c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 8452 bytes

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