Malicious PDF — malware analysis report

Static analysis result for SHA-256 8147fb9cd064b97f…

MALICIOUS

PDF

50.9 KB Created: 2020-10-06 21:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ff214ba562e1a0b928daa8228f268869 SHA-1: 8124eaff67c8beafe53a193717916881040d9e0e SHA-256: 8147fb9cd064b97f45cfffdd6d4b5624099eb3a90135bad4d03d1b75fecf9fe4
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.link/pify?keyword=nikon+coolpix+aw100+battery In PDF document text
    • https://site-1039793.mozfiles.com/files/1039793/57688294240.pdfIn PDF document text
    • https://site-1036828.mozfiles.com/files/1036828/89207056282.pdfIn PDF document text
    • https://site-1039573.mozfiles.com/files/1039573/80886260046.pdfIn PDF document text
    • https://site-1039360.mozfiles.com/files/1039360/kaxat.pdfIn PDF document text
    • https://site-1040982.mozfiles.com/files/1040982/tugesij.pdfIn PDF document text
    • http://lujodovef.catcaricature.studio/uploads/1/3/0/8/130814297/jexiv.pdfIn PDF document text
    • http://files.chardoncommunityactionteam.org/uploads/1/3/1/3/131384018/pugotut-newifuniz.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/1/0483/0583/2099/files/diluwuxirosixasatixuvif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2717/1990/files/fagimani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0490/0651/0247/files/49137034453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/6260/8280/files/golexujerorum.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_off00006542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6542 5380 bytes
SHA-256: 30646bdd5369c7fb07fb37410adc7833e342d75d9e9cc29c01f99d85acd7c411
font_01_sfnt_off000077c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 15140 bytes
SHA-256: 83a7dd2a070dff85d5607f3ca6f675f30c96c7520675a5fc4ebcd701ab950a9d
font_02_sfnt_off0000a771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA771 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140