Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5330d50c544b44a…

MALICIOUS

PDF

66.2 KB Created: 2020-11-02 19:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: d3eb847fc8adc4ec02fa6d539bbfad04 SHA-1: fbe532ff6b9141299ee0a4605b76771d102757b5 SHA-256: f5330d50c544b44a075eb98c2b91706e1f549cb7851b1d3acb87fe2c566b5479
142 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.
  • 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://ggtraff.ru/aws?keyword=3rd+grade+storytown+resources In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5f9fd96f7b762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f882562ec637.pdfIn PDF document text
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/lowuji_vitaxulunipa_feweraxani_xedevibulezi.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/xodulunezuvuwedun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f8a25dd713b9.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/susopuzupure/autodwg_to_dwg_converter_2018_serial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe09a64c-75ed-48a2-bea9-baca5bbed3c7/dutuvavulupisogolidax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e397d4-323b-4169-85b9-4b084bf4a38a/henry_clay_frick_house.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0509/4231/2635/files/pofosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1561/6681/files/miseniwukenotul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8570/0519/files/mepegixerizevotulenasoj.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C17 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000ac0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0B 5340 bytes
SHA-256: 85b6dffff08de427d4256bf02d9bafac3110b854deb6808227668f632ba5b2c9
font_02_sfnt_off0000be57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 11780 bytes
SHA-256: 1942cddd711c369a8c7a87cd66b8546bd512373f623bff798b679c3d4af4b3a8
font_03_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 16096 bytes
SHA-256: 4936cfea8caa47560990797cd2c4c6221db66ff6d6108450f6bfbefc465c3cb4

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