Malicious PDF — malware analysis report

Static analysis result for SHA-256 6434dfa280079fb2…

MALICIOUS

PDF

44.8 KB Created: 2020-10-13 18:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 05879c42bb9d49e52088ac034657f03f SHA-1: 3d4ee7bf46f0ad2aa7339d6805bcaf5b61eceb97 SHA-256: 6434dfa280079fb240d56ec4c82502441e2da17e3a602df2b98511927f3d8afb
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to redirector domains, identified as part of an SEO link farm designed to lure users with seemingly legitimate content like 'exercices de maths'. The ML classifier strongly indicates maliciousness. The embedded URLs likely serve as a lure for phishing or to download further malicious content.

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://gettraff.ru/strik?keyword=exercices+de+maths+5%25C3%25A8me+enchainement+d%2527op%25C3%25A9ration+pdf In PDF document text
    • https://site-1036748.mozfiles.com/files/1036748/4268097848.pdfIn PDF document text
    • https://site-1040177.mozfiles.com/files/1040177/lopafeligu.pdfIn PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/88372566205.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/3627853086.pdfIn PDF document text
    • https://site-1045389.mozfiles.com/files/1045389/mezuj.pdfIn 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://uploads.strikinglycdn.com/files/e18e4360-3cb8-402b-b60e-ce67730dea50/30264438605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8b5ce2-5ec8-4472-aaea-d518a6d2d3c3/supubukofepezegosije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bb8882-4f8b-40a3-a586-95ece93a368e/90597655242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb7b222-51ae-4e12-a921-9b4801f6bb14/pamafafexifegodupiwozamef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacf38fd-f2f6-43d0-831d-ee92c7053b83/28423589455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b05a95d-8b98-45e6-8a35-87a752a24950/7260261669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/79311382186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2451/7790/files/busy_as_a_bee.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_off00005c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C34 5620 bytes
SHA-256: c9aacae94f7f92090240cc82adeeff53f0dff2405d9f0203b41d1e30c91ca006
font_01_sfnt_off00006e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E98 11976 bytes
SHA-256: 939b8420b8355a76dcf60db4b43c020f58e7d89a4f247c5fc99434df83bba193
font_02_sfnt_off00009533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9533 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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