Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d538ab640fa12f…

MALICIOUS

PDF

44.2 KB Created: 2020-04-16 05:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d585ce96bf8581e4c78540abd56b7b8a SHA-1: 4acb7cf294c056c0072ce05db96f3a19bb86c527 SHA-256: 90d538ab640fa12ff45f1e6883c2bf140bce4f4c8d057be5ea86970c8e344e46
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents. The primary lure appears to be related to the 'Minions 3 movie in tamil', suggesting a tactic to attract clicks through popular search terms. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, likely intended to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample.

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://whitemanwaking.com/uploads/1/3/0/6/130620297/130620297.html#minions+3+movie++in+tamil
    • http://helloinfinta.com/uploads/1/3/1/4/131407571/zuwexe.pdf
    • http://balipacific.org/uploads/1/3/0/8/130814009/8540115.pdf
    • http://khuloudkonsultancy.com/uploads/1/3/0/7/130776740/3942139.pdf
    • http://alexanderofficepark.com/uploads/1/3/0/6/130604563/5158967.pdf
    • http://sammyfit.net/uploads/1/3/0/6/130639899/4888921.pdf
    • http://travelmann.net/uploads/1/3/0/8/130874285/2d0b54f5760.pdf
    • http://nilserickson.us/uploads/1/3/0/3/130313577/ruzujurutogimerug.pdf
    • http://ronmoore.solutions/uploads/1/3/0/9/130969603/palulexuk-zuxugafi-vugizexi-levolawam.pdf
    • http://ouidadhasbun.com/uploads/1/3/0/5/130551564/jarutakejulanaj_sodem_jenikedemame_wolagatige.pdf
    • http://eloiseyoga.com/uploads/1/3/0/2/130288684/sumojinabedigom.pdf
    • http://songlianinc.com/uploads/1/3/1/4/131438059/775589.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ef9.bin
1a7850dd366bc816a5833c6316480d894f92cca6f76f37a3d2c993e22496e5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF9 8412 bytes
font_01_sfnt_off00008f6d.bin
2f79ba52acca039e5c354f09c372eb8b3e5c303dfc88b98fa2ec462876c681ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6D 16160 bytes

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