Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f50cdaf9f10ddd…

MALICIOUS

PDF

35.1 KB Created: 2020-10-04 04:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: df9aa3e6fcb3cb62c799c6009f5552ce SHA-1: 60f77fc25f4c43adfa415539af2c55eb3ec5ae41 SHA-256: c9f50cdaf9f10ddd390851d8e300cdef7995cbe387e3f9d99e7c71aee414ff68
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://ggtraff.ru/strik?keyword=matlab+data+acquisition+toolbox+manual In PDF document text
    • https://site-1038378.mozfiles.com/files/1038378/disewifefisa.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/68882712119.pdfIn PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/35828289398.pdfIn PDF document text
    • https://site-1038920.mozfiles.com/files/1038920/gesikuvojafokotodom.pdfIn PDF document text
    • http://wopubif.sherirobersonhorsemanship.com/uploads/1/3/1/4/131437774/pojewijikejopa.pdfIn PDF document text
    • http://files.duganspecialties.com/uploads/1/3/0/7/130739525/xejekujolevixa_zavol_noxuxife.pdfIn PDF document text
    • http://sutum.hudsonvalleyrwa.org/uploads/1/3/1/6/131607022/rekudokori-bagavigo-goselud-posiluzivez.pdfIn PDF document text
    • http://zugexa.beyondessentialoil.com/uploads/1/3/1/4/131407876/nejugis-puzutesix-ranizi.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/1/0479/6068/6748/files/communism_vs_capitalism_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9039/4788/files/gravity_guy_unblocked_flash_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6826/3062/files/dutodoguku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4438/1082/files/police_motorbike_chase_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/fisher_investments.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/af_form_hurt_feelings_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/juvinodovawovikova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1228/4831/files/burrito_bison_revenge_unblocked_internet_games.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_off00004dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD4 5328 bytes
SHA-256: a5e1a48c0f1b7a72061142902fc6363f08dc70a6accf296e3c9602a26682b636
font_01_sfnt_off00005fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 9376 bytes
SHA-256: 506e49c719a5dba5bdb22d0d1b10f9be2b82143ed27552f5d73bfc5da15a6a77

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