Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b74f89f7a5916f…

MALICIOUS

PDF

41.3 KB Created: 2020-10-08 21:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 50140d19558d62fe671ea09f36bbd6ca SHA-1: 7827d5dad10be6ccf4081af276716b6a73842c57 SHA-256: 31b74f89f7a5916f34ef516688a6b22c645c6a8fd0b297edc168459e3bba7188
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.link/pify?keyword=the+dumb+test+game+2 In PDF document text
    • http://files.jentherapy.com/uploads/1/3/2/6/132681772/minekor.pdfIn PDF document text
    • http://files.communitynavigatorsinc.org/uploads/1/3/2/7/132741269/54550aa6c4e6.pdfIn PDF document text
    • http://files.professionalbusinessvaluers.com.au/uploads/1/3/1/4/131452838/fimoreja.pdfIn PDF document text
    • http://vakaxaxaj.goodsonsilver.com/uploads/1/3/1/6/131636855/50fb4512.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/texojimususan.pdfIn PDF document text
    • https://site-1043120.mozfiles.com/files/1043120/577063216.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/1/0500/5944/4382/files/mygica_media_center_17.1_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5028/9320/files/yawning_portal_map_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7859/9066/files/jopatomidosuwunebuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3223/5165/files/33316767215.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/80984772099.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_off00006221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 5332 bytes
SHA-256: 8d28a1a9e370bee92ad41796f76279bea5e17417e53833ff2834671d597a88c8
font_01_sfnt_off0000741a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741A 10656 bytes
SHA-256: b6a6788ba118f4d44bba181caf6f6a1dbacc3528edf12bc73e541bfdac4cb187