Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71ab6fc9c66a737…

MALICIOUS

PDF

42.1 KB Created: 2020-10-19 22:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 25e66da01877db4aee219149d2817810 SHA-1: c63d85fb508391881b2aa49c0ba82f897bd5440e SHA-256: f71ab6fc9c66a737a60d3594e53f308ccceb1e640e5609d5e4d8f1ad48559072
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/123?keyword=tacticool+mod+apk+1.0.3 In PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/zikula_kalefiwopuruda_rerobiza.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/buzidu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f826168-84d7-42ea-8fb6-195de0c175e4/bixosuxipepijakani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe4e382-6cc0-4023-9eb2-291ce8affe02/banajitezewumizasufilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a264bf-e716-46fc-81bd-e8bdd80cc849/sibigataligiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec70f328-0154-44ba-80ad-5a03db48b92a/60448151863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee60302-b721-42fe-a51e-6b52953f28e6/95763464123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a25926e-cd90-4e11-b9d6-69ca8062f72a/gelewumekorirexazusiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e18619-cce1-4824-a278-2f82951a188d/80505707114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cfcaa5-6cc4-4525-9540-e21a5dc6fc0a/tuwul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9779/0366/files/85234721081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7236/3432/files/tasuwob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/xuvitutufopexovemido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6153/5132/files/elmos_world_computers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1349/7251/files/75570239518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8496/4540/files/skyrim_light_armor_trainer_follower.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/43125475753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4702/2492/files/31600276767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6733/3525/files/yashica_mg-1_repair_manual.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_off000067a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 5348 bytes
SHA-256: 45d96af108d4c66d318635d0bd5c42ac5b60e4706baed56b77112e265b9e3298
font_01_sfnt_off000079c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 9896 bytes
SHA-256: ad91e5a2577711ad12216d32208d524407bfcbe1a6dca755c97714c76d33d302