Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde5a5387c1a3050…

MALICIOUS

PDF

50.8 KB Created: 2020-09-12 20:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5834f59914e7e6498f65901a3b28a8af SHA-1: 3f004f7f1761b77302a4409dd0eb990222824fb1 SHA-256: fde5a5387c1a3050397cb4df7cc7594953af29afc4649b1ea9950854a755a135
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=biogeography+worksheet+answers In PDF document text
    • http://ranut.projbridge.org/uploads/1/3/1/8/131872203/guget-vixaxutaxajukak-nimebedas.pdfIn PDF document text
    • http://files.hufftrax.com/uploads/1/3/1/4/131409909/mareleka.pdfIn PDF document text
    • http://files.frippfriendsofmusic.com/uploads/1/3/1/4/131407406/2108315.pdfIn PDF document text
    • http://nagexole.organizedbyadrienne.net/uploads/1/3/1/3/131378960/gebasovafege-nudimezur.pdfIn PDF document text
    • http://somika.bensonmarshall.com/uploads/1/3/2/6/132696483/3154344.pdfIn PDF document text
    • http://files.minimalistboutiqueskincare.com/uploads/1/3/1/3/131398332/ac7ee0553604eb.pdfIn PDF document text
    • http://zosokasa.thechristiancommunity.org.za/uploads/1/3/1/6/131606575/lapozazonof.pdfIn PDF document text
    • http://doveb.joyousdino.com/uploads/1/3/2/6/132681072/piputi.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/1/0433/0323/9840/files/ranuvuvijerajamiwebaxewa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4845/0718/files/david_goggins_can_t_hurt_me_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/batib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3236/3687/files/lulugul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/futasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8410/2297/files/cad_dwg_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1204/6495/files/chrome_proxy._exe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C7 5356 bytes
SHA-256: cb7f8c392029bfbfeac2340d83f5e332f6930cac5a63af143b90f6c52d6b371e
font_01_sfnt_off00008612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8612 10288 bytes
SHA-256: 0ec5e1b0cd9148a5a67c5eaf4a6c1c52272ed36e5736674a869d508702735654
font_02_sfnt_off0000a965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA965 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d