Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7df2ac10e5148df…

MALICIOUS

PDF

39.1 KB Created: 2020-10-30 21:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: dce9ac28c81866e5fba51890e0472658 SHA-1: 0b2407cf49d4eef9c9a26e023716eb090e63d67b SHA-256: b7df2ac10e5148df22b8cda7fb5f077e0b668b36738f5ac1b0ffb4793615136e
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=quantum+3212+manual In PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/46585fa7fa5af62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/walapaviwubixiduvum.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/nikon_coolpix_l105_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2208/5027/files/86261957913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68634424-090d-4021-b54a-2cefb8154b7e/tipos_de_plasticos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5732/2430/files/4796055635.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/kezigubejupubepinoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3114/1783/files/8th_grade_science_staar_review_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4131/6264/files/final_fantasy_x-2_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/88751559092.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_off00005c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 4968 bytes
SHA-256: 3962dbf6d54a9465e6e8369e658c4a547180246929c3c64651765d283321b858
font_01_sfnt_off00006d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D26 10224 bytes
SHA-256: c0fb77a675b6220cf3cb251723b051b9790fcc95cabfd1888be25ad09d985d1b