Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff31055d7fd5dd1…

MALICIOUS

PDF

50.6 KB Created: 2020-10-11 18:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9b368a615bf6b4b3d33d72bdcef24c43 SHA-1: 2e5b14adc78b9dff691b5295d63196bd8eb755b5 SHA-256: 8ff31055d7fd5dd15a52a50f1deb943ef833e37c257fae0236ceb1b0fd8eff83
134 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 that redirect to a malicious URL, identified as a redirector for SEO-based phishing lures. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links. No scripts were extracted, but the primary attack vector appears to be a phishing lure designed to trick users into downloading potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=365+dni+blanka+lipi%2525C5%252584ska+pdf+free+download In PDF document text
    • http://jivaxugak.acidrecovery.com/uploads/1/3/1/1/131164250/gepoxakuzigom_timaxoduxigamup.pdfIn PDF document text
    • http://xagedo.acorridor.com.au/uploads/1/3/0/8/130874493/0aa96.pdfIn PDF document text
    • http://wijaxex.kostichart.com/uploads/1/3/0/9/130969963/3230708.pdfIn PDF document text
    • http://files.miltonmurray.org/uploads/1/3/1/6/131606644/nelemilor.pdfIn PDF document text
    • http://tikepum.celebrityartbypam.com/uploads/1/3/0/7/130739664/gesebaviruloxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e834f55e-1130-4933-9911-a62939f4f206/kozefuvozudoluvazevav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf169bb-bc52-4d15-9e1e-f43d0208bc2b/65647029371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687cc8d3-3806-4576-8dbc-67187a58b1df/fotezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf59c4b-8054-4c21-8d89-1ede72c76d70/dasamoverojorilejasobuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3b15bd-e5c8-4c86-beb5-60533a925059/darege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3187/4714/files/joruzofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4364/7399/files/82534280397.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1516/3032/files/dark_souls_2_save_file_download_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1827/4981/files/harry_potter_height_and_weight.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7093 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000817a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817A 5804 bytes
SHA-256: eaf200c8ba8432f74685a937128f61593abe0a93793e3eea25f1b6a71193037d
font_02_sfnt_off0000950b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x950B 11144 bytes
SHA-256: 37fa355a37a8c684e577afdb9a3fd310bb6d2a61e8e42362fe615b774488156f

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