Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2dc2e98e1a72b5…

MALICIOUS

PDF

52.9 KB Created: 2020-09-21 11:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a741af61203e04cce3a5ede02de2277c SHA-1: 36c66f0e9c81811eb53d45b72d45e2caadcfc9a6 SHA-256: 4f2dc2e98e1a72b5634cfd98ca50edf775217cd9a18e41d0b661e7e5e23db6d3
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 https://ttraff.cc/wix?keyword=spotify+premium+offline+songs+apk In PDF document text
    • http://files.mpiireofficial.com/uploads/1/3/2/7/132740237/kilef-bodexikurejize-raredovivinaveb-mabiminomofake.pdfIn PDF document text
    • http://files.908elmstreet.com/uploads/1/3/1/3/131398428/8866261.pdfIn PDF document text
    • http://files.twincitiesproam.com/uploads/1/3/2/6/132680808/vexumegabipiwivimog.pdfIn PDF document text
    • http://files.whitestole.com/uploads/1/3/0/8/130814402/6606813.pdfIn PDF document text
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdfIn PDF document text
    • http://files.youthrisetogether.com/uploads/1/3/0/7/130776296/doroz-minomupokij-dibimawikaxebav-konutepuwiwedol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3140/3413/files/tamil_movie_rockers_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/kodefobesawaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sividejujim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5068/0991/files/ralemaxudaxewat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/36726096286.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/8610416744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/21124099194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/67214576600.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000798f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798F 5492 bytes
SHA-256: 758a952b43fb1734932e292010f1bacf59faa29afbcee68d033237b29f074ec4
font_01_sfnt_off00008c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C32 10756 bytes
SHA-256: 42f398d5d78ae512473bd62e0dfcd7111f3d878babca4cdbb3ff1d2f10b7bac5
font_02_sfnt_off0000b0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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