Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f028fd9d83d7c8…

MALICIOUS

PDF

53.0 KB Created: 2020-08-25 22:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d81575fab451c041308420826acaf87 SHA-1: ebd4eff8f88abc499ca587948a96453d2ecf03ab SHA-256: 76f028fd9d83d7c8d267a22c4063f30de6469d37170bda6eed27a16a9cbb521c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure ('Pathfinder ratfolk guide'). The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a malicious site for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.
  • 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.
  • 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.cc/pify?keyword=pathfinder+ratfolk+guide
    • http://butotori.embcmanning.org/uploads/1/3/0/8/130873830/todagefelesu-nulasaguxox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7360/0678/files/subject_and_verb_agreement_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/andr_luiz_santa_cruz_ramos_direito_empresarial_esquematizado.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/divisiones_de_la_ecologia_autoecologia_y_sinecologia.pdf
    • https://cdn.shopify.com/s/files/1/0454/6779/5608/files/deep_learning_adaptive_computation_and_machine_learning_series_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/6116/5723/files/56882552588.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/wobuwijavazi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3856/2712/files/17572710718.pdf
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/1995_toyota_corolla_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/3013384763.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/40609646756.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7138/files/bodine_b50_spec_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/lemubanitisepezilos.pdf
    • https://cdn.shopify.com/s/files/1/0460/9009/2708/files/jerupuzufi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000093d2.bin
6c1a3f4e46f9cccec9cf8e19bf101312e686fed46721b4c05018f1ba2687b1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D2 5056 bytes
font_01_sfnt_off0000a4fa.bin
db8b50b8e0b3f3c51bec91557334a97020e9a6665d8fdcd248890b238f899ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FA 10140 bytes

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