Malicious PDF — malware analysis report

Static analysis result for SHA-256 4300c70ffefff97c…

MALICIOUS

PDF

36.8 KB Created: 2020-04-11 08:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9dc250fd2c960f9ae5223e477dfe906 SHA-1: bf379430b64865376972e1b88796140cf95a686b SHA-256: 4300c70ffefff97c2742250b5404ec801e3d99e7fa60396f9ea349f6a372b62d
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that appears to be part of this scheme, likely intended to lead users to malicious content.

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://bsa-sccc-pack301.com/uploads/1/3/0/5/130590363/130590363.html#let+it+go+piano+accompaniment+pdf
    • http://stitch101airborne.us/uploads/1/3/0/6/130604678/rujewutufade.pdf
    • http://ecreviewers.com/uploads/1/3/1/0/131070284/digoduwenikereg.pdf
    • http://worldwidegreatescapes.com.au/uploads/1/3/0/2/130272582/a51f4.pdf
    • http://kaileyeskine.org/uploads/1/3/0/6/130620393/nilowetufonasuw_kubozereru_popala_jomowinikapazor.pdf
    • http://maximilianioan.com/uploads/1/3/0/5/130545816/8975948.pdf
    • http://voiceofcassandra.com/uploads/1/3/0/3/130312973/1746401.pdf
    • http://ellelouiseferguson.com/uploads/1/3/0/4/130483863/2856e37ceb1a.pdf
    • http://ridgebackfield.com/uploads/1/3/0/2/130272928/1144192.pdf
    • http://mail.tavernandtap.com/uploads/1/3/0/7/130775551/fijafiba.pdf
    • http://livewellbeautybodyworkwellness.com/uploads/1/3/0/6/130621495/b375a64a7.pdf
    • http://fashionablyshort.com/uploads/1/3/0/5/130544386/5d9769548.pdf
    • http://stardoglogistics.com/uploads/1/3/1/1/131163788/malefatikel_wubuvusijo_kumaninud.pdf
    • http://ilmegliore.com/uploads/1/3/0/5/130543261/viwavowerafoti-natosipema.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_off000063d7.bin
bcd2fc33034697ebcbb3f026e87c13a2adf7a80d12bfdc3f924814eb8ded3f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 8732 bytes

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