Malicious PDF — malware analysis report

Static analysis result for SHA-256 83114e6d8b79fe68…

MALICIOUS

PDF

138.3 KB Created: 2020-10-30 02:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6847d2f31e80007189e122259e3dc731 SHA-1: 975c6f2f59942f94178f2b466b6eb479daadff01 SHA-256: 83114e6d8b79fe68bf675cd474e0d61ac72e8c84074a1acce6184dc4b7aa3b55
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple heuristics indicating it is a malicious redirector and part of an SEO link farm, specifically designed to lure users with a fake school supply list. The embedded link, https://ttraff.ru/pify?keyword=forest+ridge+elementary+school+supply+list, is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to deliver a malicious payload via a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=forest+ridge+elementary+school+supply+list In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7855/2218/files/23034853814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/naxige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa954a48-4a17-4ee0-a27b-5f68c1117b2c/vekafirakalodevusaxikaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3307bb63-6ee8-4df3-ae75-436565d2c46e/lisirezanujuvibaj.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/kung_fu_panda_3_song_kung_fu_fighting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1670/4159/files/example_of_the_difference_between_proactive_and_retroactive_interference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e902a581-1d66-40e6-820b-27bf0bcccffb/atl_free_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e577c18d-2954-4299-8f9c-6dfe82035d9f/74982361663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01cab45d-ad8d-4edb-924a-058bca16db70/aurender_conductor_app_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54263509-ca80-43ef-9552-fd291edecb9e/78861157017.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/arnold_schwarzenegger_bodybuilding_encyclopedia_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4a57e5-9f13-4c7b-88b9-cad7beba750e/xosulazojebutuvinugigofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373625fd-6148-46b5-aa25-f066b817668d/565781820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc4960b-524a-49f1-8042-17417145a06d/43016491399.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D677 5428 bytes
SHA-256: 7c757cbd9ac61715564a30ad6d70851082b89c71963a05424c8b99ebdc505a0b
font_01_sfnt_off0001e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8C2 11076 bytes
SHA-256: 9a4c0e5a4edf080a9e7006c282e865e7da03e831b67daaad54c9e4fed2f69e86
font_02_sfnt_off00020d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D78 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f