Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13dd471fbe8a9e9…

MALICIOUS

PDF

38.0 KB Created: 2020-03-11 03:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: caaa6290add1de8a8309795f1b48e30f SHA-1: 3b94b8ba62d2c92b9bee99ba80e28ebc8bcd4265 SHA-256: f13dd471fbe8a9e9d27eb36f03f2aba84d3fef6aa22997d87d01d3968e52871a
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 are to PDF files with numeric or generic slugs, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, references 'worksheet answers', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://www.perfectgiftsanytime.com/uploads/1/3/0/7/130738881/130738881.html#angles+formed+by+parallel+lines+cut+by+a+transversal+worksheet+answers
    • http://roadhouse74barandgrill.com/uploads/1/3/0/7/130739680/9111061.pdf
    • http://markrath.com/uploads/1/3/0/3/130379228/1848061.pdf
    • http://ashapili.com/uploads/1/3/0/7/130775220/2356270.pdf
    • http://ofunatic.shop/uploads/1/3/0/2/130270843/bapiriposona.pdf
    • http://repentir.me/uploads/1/3/0/6/130620841/tasobixunomipofu.pdf
    • http://kingswoodsquare.com.au/uploads/1/3/0/5/130588842/mapivibalixuforozebi.pdf
    • http://essentiallyluminous.com/uploads/1/3/0/5/130588149/2781353.pdf
    • http://jasonandwailin.com/uploads/1/3/0/2/130288761/9aa0dd.pdf
    • http://lastwordsspoken.com/uploads/1/3/0/5/130540461/6a898915353a8.pdf
    • http://introligatornia-katowice.pl/uploads/1/3/0/6/130604006/wopozazunotavimorizo.pdf
    • http://beckerclassroom.com/uploads/1/3/0/9/130969916/sesewifadixofarifug.pdf
    • http://dumarsinc.com/uploads/1/3/0/4/130435561/8666056.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_off00006802.bin
ff8726e420cee261425e28d4cf95c51d9d034f36abb63ed8abf65f6805118e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6802 8408 bytes

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