Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0faf6e5c834e88…

MALICIOUS

PDF

33.9 KB Created: 2020-06-04 14:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c9dc2deefeee3ce58794771c801c3a SHA-1: 7445aafd4e2d3cf5ddfe37ab8416c141a3e6e8f0 SHA-256: bd0faf6e5c834e88cd5f6f6e7a6830814c4f88bfff7177b3b278e9a6954c8673
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body and extracted URLs suggest a lure related to a crossword puzzle answer, which is likely a pretext to drive traffic to these external resources. The ML classifier strongly indicated maliciousness, supporting the interpretation that this is a link farm designed to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://timothykgiordano.com/uploads/1/3/1/0/131069869/131069869.html#repaso+del+capitulo+crucigrama+answe
    • http://dimet.asia/uploads/1/3/0/7/130739536/jixurelexaxe.pdf
    • http://wisdomphilosophy.com/uploads/1/3/0/4/130483928/xelapasutedul-kawuk-lumogaxe.pdf
    • http://preview.americaniron.com/uploads/1/3/0/2/130272083/zabejesaporimotesa.pdf
    • http://beckyhagan.ca/uploads/1/3/0/4/130488311/8928217.pdf
    • http://coolcustomcreations.com/uploads/1/3/0/8/130873890/8472176.pdf
    • http://mail.beanandro.com/uploads/1/3/0/4/130483238/xixorugerikobunodex.pdf
    • http://pettersenproperty.com/uploads/1/3/1/4/131437484/7873825.pdf
    • http://marriottediting.com/uploads/1/3/0/5/130589345/nikewan_meriritu.pdf
    • http://webdisk.marissaoneil.com/uploads/1/3/1/0/131070488/82ddf.pdf
    • http://timothykgiordano.com/uploads/1/3/1/0/131069869/terms.html
    • http://timothykgiordano.com/uploads/1/3/1/0/131069869/dmca.html
    • http://timothykgiordano.com/uploads/1/3/1/0/131069869/policy.html
    • https://xowerunopop773792899.files.wordpress.com/2020/06/94612715445.pdf
    • https://womonuxad.files.wordpress.com/2020/06/62182712119.pdf
    • https://nijatenojowo.files.wordpress.com/2020/06/23706535195.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_off00005705.bin
b0a516b15f7874b661bd49c6452251bc15fa5cbeb716d639a9dba05ff8e88f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 10664 bytes

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