Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c800c611e2a986…

MALICIOUS

PDF

38.8 KB Created: 2020-05-16 03:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3626bf301608493830072fa4d83b6e5b SHA-1: 82a577be391a88d074c7f2d3d9d7f74c09b665cb SHA-256: 54c800c611e2a9867bfc9d62b7c701d74b96c3050281fa235230857efbdff214
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to uniquely named PDF files on various domains. This pattern is indicative of a link farm or SEO spam campaign. The presence of a specific URL related to 'android studio kotlin game tutorial' suggests a lure to attract users interested in that topic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://royalcrownedhair.com/uploads/1/3/0/6/130605501/130605501.html#android+studio+kotlin+game+tutorial
    • http://bouldercreekexteriors.com/uploads/1/3/1/4/131436972/wogufegovaset_larewir_wujatow.pdf
    • http://tipsytacocantina.com/uploads/1/3/0/4/130435577/wabigozenaret-pesusinakeval.pdf
    • http://belizefoodservice.com/uploads/1/3/0/4/130483062/3422039.pdf
    • http://yourchartersoffreedom.net/uploads/1/3/0/9/130969332/ec47e8ac288781.pdf
    • http://rivercrestpto.org/uploads/1/3/0/3/130313117/vonofad-netarararulab.pdf
    • http://paintedhillsrentals.com/uploads/1/3/0/7/130738994/28e71e.pdf
    • http://redsquarecommercial.com/uploads/1/3/0/5/130588625/weviz.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_off00006aca.bin
b1bd191f830b3f56ddc93502dcc133e094ab6b093d1671ae1bda018d3a042d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACA 10996 bytes

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