Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba82b8d1ea3b2a4…

MALICIOUS

PDF

37.2 KB Created: 2020-04-02 16:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f16505fbdc99c91b116ae8394e873866 SHA-1: c4cda3ebeeebee68877b4b5ebb221311da919867 SHA-256: 7ba82b8d1ea3b2a472beccf3c268cd795bccc36abe35e5aeb273933e05a23923
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, includes the text 'Hard logic riddles with answers' and references 'wkhtmltopdf', suggesting a lure to external content. The primary function appears to be directing users to a network of linked PDFs, likely for SEO spam or to host malicious payloads.

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://753spa.com/uploads/1/3/1/4/131452987/131452987.html#hard+logic+riddles+with+answers
    • http://jeffreydallasmettler.com/uploads/1/3/0/5/130551472/lawiwufanepuwujuwi.pdf
    • http://crooksandsinnersclub.com/uploads/1/3/0/5/130544652/cde70f08630ca0.pdf
    • http://oneskyconnect.com/uploads/1/3/0/5/130589283/7545313.pdf
    • http://signalme.club/uploads/1/3/0/4/130488270/8509920.pdf
    • http://ambertraina.com/uploads/1/3/0/7/130739375/f40dbf679782.pdf
    • http://destinationsuccesscounseling.net/uploads/1/3/1/4/131406289/muxeraxesisuj-voxevafezix-mozaxigifamut-fowuruganenaxa.pdf
    • http://localgrownfoods.com/uploads/1/3/0/7/130775223/pejadujujugi_xesisawurita_zogaxivabimaki_bisax.pdf
    • http://toscanoconstruction.com/uploads/1/3/0/5/130589268/potigasipijujenoliwa.pdf
    • http://jukeboxarcade.com/uploads/1/3/0/7/130776695/kolibedapusefa_kubizageligava.pdf
    • http://gwinnettcleaningservices.com/uploads/1/3/0/7/130739315/juwutisis_zilik.pdf
    • http://lethbridgetowing.com/uploads/1/3/0/6/130604187/0c0578.pdf
    • http://currysfunfairs.com/uploads/1/3/0/2/130272102/bfc8ff823fa6.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_off000068d9.bin
62d409a3dbebe33ceea00ba2e4dd0c62d5e4357e36cefc52a08d381b9990cc78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D9 8012 bytes

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