Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17bbc99569d35ec…

MALICIOUS

PDF

48.4 KB Created: 2020-04-22 04:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e576efb8b2a1ad998ed6111971719e15 SHA-1: 5033048053059591465422b432b9487bee89f03d SHA-256: c17bbc99569d35ec96b658796ee2b7b339efc6682f3aee7a6b06838864562e2c
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to PDF files with numeric or generic slugs, indicative of a link farm. One prominent link, http://clickinteriordesign.net/uploads/1/3/0/8/130874339/130874339.html#terraria+android+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE, suggests a lure for downloading a game, likely a social engineering tactic to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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://clickinteriordesign.net/uploads/1/3/0/8/130874339/130874339.html#terraria+android+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE
    • http://monicavaladezcreative.com/uploads/1/3/0/7/130776219/d429d7c.pdf
    • http://easypeintures.com/uploads/1/3/0/3/130313404/degamoselani-tojimeludesawa-dotibemafi.pdf
    • http://brightonpsychotherapy.net/uploads/1/3/0/4/130478347/3315136.pdf
    • http://kulturekeepers.com/uploads/1/3/0/2/130272390/zopunepabil.pdf
    • http://www.vitalogynaturals.com/uploads/1/3/0/8/130814121/6438569.pdf
    • http://airsprayusa.com/uploads/1/3/0/7/130738825/1241289.pdf
    • http://bubblecrop.com/uploads/1/3/0/2/130272500/a7eaf.pdf
    • http://medicon-personal.team/uploads/1/3/1/3/131383959/fejefitidileroboji.pdf
    • http://great.foundation/uploads/1/3/0/8/130873802/5988374.pdf
    • http://vtlsecurity.net/uploads/1/3/0/7/130739532/145849.pdf
    • http://retratitos.com/uploads/1/3/0/3/130323635/xojamip.pdf
    • http://blissbombshell.com/uploads/1/3/0/4/130483142/90ccd03072f4df.pdf
    • http://wordslingerministries.com/uploads/1/3/0/2/130270993/nufazumo-miwuxeda-gamujegutimufef-ruputebev.pdf
    • http://rtcustombuilds.com/uploads/1/3/0/2/130271098/merikepofosuj.pdf
    • http://customdogportraitart.com/uploads/1/3/0/6/130621201/0c2f8cefea.pdf
    • http://airsprayusa.com/uploads/1/3/0/7/130738825
    • 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_off0000739b.bin
518003ada64bbf6dfb478cc75659803a57b813c0bd31b795661b9230425c0c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739B 12844 bytes
font_01_sfnt_off00009d77.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D77 16036 bytes

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