Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3c5b53a237faf3…

MALICIOUS

PDF

39.9 KB Created: 2020-06-03 07:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9f8d1b0ffab241380206fba038e98ab SHA-1: 5efd2d04165180e8ea5ee904284cf65f92692f59 SHA-256: 4e3c5b53a237faf37a4242c95ccfa462ee3e888e7264ac7b241faeda0e96534b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on newly created domains and appear to be part of a link farm. The document body, though partially corrupted, suggests a lure related to calculating heart rate for weight loss, which is likely a pretext to drive traffic to these malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm attack pattern.

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://revolutiononline.org/uploads/1/3/0/4/130435783/130435783.html#calculer+sa+fr%25C3%25A9quence+cardiaque+pour+maigrir
    • http://westchesterintegrative.com/uploads/1/3/0/6/130621544/sumunuresurivuputu.pdf
    • http://jpanow.com/uploads/1/3/1/4/131407547/pobilipapawuwimijeri.pdf
    • http://sholansun.shop/uploads/1/3/1/3/131379928/zafedosab_votawibo_ziferapemazaj_nemejewixinos.pdf
    • http://safemoneyagentlocator.com/uploads/1/3/1/4/131406506/kedafigap.pdf
    • http://mail.gavenwilson.com/uploads/1/3/0/6/130604689/lijotikipadamedolori.pdf
    • http://thinkitbeitthoughtcoach.com/uploads/1/3/0/7/130774973/047106e.pdf
    • http://revolutiononline.org/uploads/1/3/0/4/130435783/terms.html
    • http://revolutiononline.org/uploads/1/3/0/4/130435783/dmca.html
    • http://revolutiononline.org/uploads/1/3/0/4/130435783/policy.html
    • https://fulazetula.files.wordpress.com/2020/05/51406064423.pdf
    • https://zitipon.files.wordpress.com/2020/05/gelobular.pdf
    • https://sinezuve.files.wordpress.com/2020/05/370043710.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_off00006b7b.bin
5d43bd6ced77668fed9797d4ea01af5c5dc6a174e20d32777bee2cd3d6f8a32d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7B 12160 bytes

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