Malicious PDF — malware analysis report

Static analysis result for SHA-256 911c44792fc20154…

MALICIOUS

PDF

42.4 KB Created: 2020-04-06 05:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 047fb95340ba82259583f49d4427c686 SHA-1: f8c2f6eb7c086153493b24afca3f024e8e0f0544 SHA-256: 911c44792fc20154d856f686d2b0e42876c21c36a07fb2cd583be73f611e91f8
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to geometric formulas. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, suggesting the primary goal is to drive traffic to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://eliminatorcnc.com/uploads/1/3/1/3/131379280/131379280.html#formulas+para+hallar+area+y+perimetro+de+figuras+geometricas
    • http://hausofbrews.org/uploads/1/3/1/0/131071295/3820340.pdf
    • http://jmcdermott2011.com/uploads/1/3/0/2/130287413/dunadud-xamikumumoko-bekuverizene-kezibeguk.pdf
    • http://childreninleadership.org/uploads/1/3/1/3/131380531/519d502c92b604.pdf
    • http://bardejugos.com/uploads/1/3/0/4/130488759/e0a2208.pdf
    • http://raphaservices.org/uploads/1/3/0/4/130489097/83aa1e2d5ddb2.pdf
    • http://shinewindowtint.com/uploads/1/3/0/3/130379173/bonomovaguxopures.pdf
    • http://sobglamour.com/uploads/1/3/0/5/130550675/zetovulagidejuwusit.pdf
    • http://picassospicnic.com/uploads/1/3/0/9/130969647/lotimin_xabev.pdf
    • http://drtehines.com/uploads/1/3/0/5/130588695/tanunirimur.pdf
    • http://mail.abyxusa.com/uploads/1/3/1/3/131383541/68ceb733bdf347.pdf
    • http://mainlymassage.net/uploads/1/3/0/9/130969659/93b7a.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_off00006da0.bin
4bdb634ab1c0f5390f2ff718caa8cdf15d99276c6f463e3e783a067987b726a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA0 8528 bytes
font_01_sfnt_off00008cdb.bin
d2b455d3ff42a0a91d1c8ae23ca6a194056b78cc944a8a7c39123cf86a109cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDB 3708 bytes

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