Malicious PDF — malware analysis report

Static analysis result for SHA-256 be37423ecc2cfd59…

MALICIOUS

PDF

39.2 KB Created: 2020-08-06 03:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e27edbeb4c25505a6441bc51bb996b04 SHA-1: f24c11ee4eaaa7f69018a39943396d2075d1cb86 SHA-256: be37423ecc2cfd591badcc439565cc52e2400d9e130ddebb677b89f659a29f78
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/pify?keyword=basic+english+grammar+pdf+free+download+in+telugu In PDF document text
    • http://jomimim.fwpmun.org/uploads/1/3/0/8/130814238/a45a7.pdfIn PDF document text
    • http://files.tomhayes.uk/uploads/1/3/1/4/131454352/ca1a66.pdfIn PDF document text
    • http://files.rhmorriesonawards.com/uploads/1/3/1/3/131398423/2759813.pdfIn PDF document text
    • http://salobet.umlawreview.com/uploads/1/3/2/8/132816066/6107975.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/1/0432/8652/8155/files/jukadivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/padikutofunotuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/88994207993.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/wesuzaloj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/selogaboxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/11314704072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/zagub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/bifubik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/41707671100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/tomb_of_annihilation_player_handouts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1090/8572/files/botitimopizamokolaxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51D2 5712 bytes
SHA-256: 106fc7e658b0c31a37ceab7b6bc7475b02d73ebaee2a51610314de50809bbbe0
font_01_sfnt_off0000651e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651E 13728 bytes
SHA-256: 78f66fcb8e2f5786ec8dc0633a4ed204f834a6b81207423def71355d6e0a78f0

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