Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f74122cf57ab72…

MALICIOUS

PDF

49.1 KB Created: 2020-10-29 18:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ecb24a4469fe6b71803db5f4b148e82f SHA-1: 225a21c7255930db3d7eb4570ef831a829f3771b SHA-256: 78f74122cf57ab7261c7e88f80cccc289e244046e8371e9af99cc8f3a8a27860
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.link/pify?keyword=joint+medical+executive+skills+program In PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/7749283.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/5312f889-e513-49b8-a0db-7ea4ea2b343b/kumoxibomuvafiwosepologos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e3fc24-d957-42bd-8d23-97e727e853d6/onn_universal_remote_model_ona12av05.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5122/1143/files/pinezovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398b1aba-2ecc-49d5-af8d-8439bf8adecf/zewisapofabe.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/small_estate_affidavit_texas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8892/7647/files/bombitup_call_bomber_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3a0a20-32cf-4a17-8197-85696fba6ee7/velupavavokerom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5732/2430/files/4796055635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68de0ff3-e626-4999-8cb3-5a2e4587fd8b/sutivonizudeviri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6390/1855/files/9577656833.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_off000073d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D8 5456 bytes
SHA-256: 046f347e4b77bcb3ed24374c011481f1e05c29cd89e28cb260e4afebc9dfc9e3
font_01_sfnt_off0000864e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x864E 10296 bytes
SHA-256: d54896b077f93a9a5ae36d944ca35f5ea26c13a52290af6e2287e54ac2b9b6c2
font_02_sfnt_off0000a95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA95C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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