Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f268dd9affea647…

MALICIOUS

PDF

93.7 KB Created: 2020-11-04 01:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7bb4505edbcb5cce45f9f7b5b3420df7 SHA-1: 32d8b5dba9b113bafd9107695f91e16f14d0134f SHA-256: 3f268dd9affea647852bdb98964c7574dc8f5cfca1d5cbfd54092d27d657b240
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and text that redirect to a known malicious URL, 'https://cctraff.ru/aws?keyword=what+words+start+with+red'. This URL is flagged as a malicious redirector and is part of an SEO link farm, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?keyword=what+words+start+with+red In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_5f9699ecbbcdc.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/9321557.pdfIn PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/8b752a6ab4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f88b3c89850d.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/regovadeje/romegabatowika.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/how_many_feet_is_one_fathom.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/92649652837.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/bayeux_tapestry_stitch.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/latonupuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a6bfe5-fa79-42e7-8ce0-3c8ee1c90330/rujekiginujororufufepanir.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/ragozubagezopopeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6864ec9a-c649-4fe7-94a5-21633265db42/51447754243.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/basic_formulas_of_mathematics.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000134db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x134DB 30524 bytes
SHA-256: 1bbdbf1c9780ee6671a683fb662c7ccb3a44c772e0e84a053e24414587abdfd2
font_00_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 4988 bytes
SHA-256: 6b93750a690e6a80d90d4dcd4fe47f89ac5c964f8ed84f9dd29c435aa3305847
font_01_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 10660 bytes
SHA-256: d261f79ca78ee155bc911553ceb05bf5dd81fdb5cb066c2c5e2d1055a8bbdb59

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