Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a3418d725b00c6…

MALICIOUS

PDF

34.7 KB Created: 2020-08-28 02:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ff6ff4f47d20725f37bef718dca85af9 SHA-1: a9a1cc3ed113d5aec972bdfd956276eeb0bb4dbd SHA-256: 55a3418d725b00c646c34ca91aeecd1d234f1d667b324abaff7eb036579f3c7c
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.club/pify?keyword=elf+bowling+7+free+download+full+version In PDF document text
    • http://files.themilev.org/uploads/1/3/1/4/131453674/wifor.pdfIn PDF document text
    • http://files.mollygaston.com/uploads/1/3/0/8/130814397/fepuliwudejugone.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/1/0428/9835/8432/files/51025654711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/512199568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0263/2104/files/texas_driver_license_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/46581885435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/rizesowozibikitolagisesaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/free_graphic_design_website_templates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/3112602130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3493/5201/files/behringer_u-_phoria_umc202hd_driver_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/fun_psychology_test.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_off000048c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48C3 5404 bytes
SHA-256: 1067faca38daa28fbf11525b8359126e73ccb43d15936551965c3e2a21102d91
font_01_sfnt_off00005b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4D 10180 bytes
SHA-256: ab5abad8e6d796d07e744611551bb7e27008f0abce192b8faba138e73e5e960f