Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37600d811760305…

MALICIOUS

PDF

37.7 KB Created: 2020-03-24 14:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e3de52b305d19ee09b96393ee4ededf0 SHA-1: eaa29fd27545916b448ef12d903f62c237a01ac2 SHA-256: f37600d811760305a48a046d7d508e81beb133a0dd2ec0397446676e9e77ff70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which are numerically or generically named PDF files, indicative of a link farm or SEO scam. The document body, though heavily obfuscated, contains a URL related to firearm sights, which is likely a lure to attract clicks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

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://mybeautyinkstudio.com/uploads/1/3/0/6/130603865/130603865.html#adjusting+rear+sight+on+taurus+g2c
    • http://latriboo.com/uploads/1/3/0/4/130490117/8c2120168a649dd.pdf
    • http://nicoletorbay.com/uploads/1/3/0/6/130621013/64b1fe70d.pdf
    • http://mta-sts.westhillsracquet.com/uploads/1/3/0/5/130550797/japadoku_dumopejavab.pdf
    • http://ustipstervip.de/uploads/1/3/0/5/130539309/3de410.pdf
    • http://www.lalaboutique.net/uploads/1/3/0/5/130550884/aab2c31ae53944.pdf
    • http://www.trymeet.dk/uploads/1/3/0/5/130545421/nifuvitakovu.pdf
    • http://mcookepc.com/uploads/1/3/0/8/130874153/fujefoledigagakoz.pdf
    • http://www.pedrolisbontours.com/uploads/1/3/0/6/130640009/d6fb9add910.pdf
    • http://www.siobhans.space/uploads/1/3/0/2/130272963/bafesi-vonivejarenedi-ginepiluvimowe-ragabike.pdf
    • http://theorlandorealtor.com/uploads/1/3/0/5/130590384/3008505.pdf
    • http://drrobashman.net/uploads/1/3/0/6/130605422/3749685a18e6.pdf
    • http://www.rollingpunches.com/uploads/1/3/1/0/131070799/3947502.pdf
    • http://thetingtimes.org/uploads/1/3/0/7/130738822/446a4d8cfe.pdf
    • http://spacequeen420.com/uploads/1/3/0/4/130476605/5156073.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_off000069ae.bin
8bf60d21cf11f21147aac47997ec5af2012381e09ef939af6d7333b01f17eb78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 8272 bytes

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