Malicious PDF — malware analysis report

Static analysis result for SHA-256 71db0a1439ed4b88…

MALICIOUS

PDF

39.0 KB Created: 2020-08-03 10:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ef42b3ff4af818467e903339dc07f8 SHA-1: a8c98b46c6caf41dd515526f7f2df39491a884fe SHA-256: 71db0a1439ed4b884b464978065fcc4e6b35422918814a6b307f4201fe0e4ca6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.cc/pify?keyword=aeneid+fitzgerald+pdf', is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious verdict.

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=aeneid+fitzgerald+pdf
    • http://files.pinetrailscia.com/uploads/1/3/1/8/131871864/sotomuxi.pdf
    • http://files.cozywritersroom.com/uploads/1/3/1/8/131872032/lesiniwutuvefepale.pdf
    • http://files.tuslawjba.com/uploads/1/3/0/8/130814124/bumigivuxamibuf.pdf
    • http://files.americanhealthservices.org/uploads/1/3/0/8/130814104/782306d0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/free_helvetica_font.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/25006372942.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/41690972757.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/96698949111.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/8122240342.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/30233098108.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/fumujajokagokiviganawuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/futazagep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/chromecast_background_images_url.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eb9.bin
b49ae7bedea673f8175147b15f9dfdc9af0456e1c0662120fffee63470b1ee31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB9 4748 bytes
font_01_sfnt_off00005ee2.bin
76bf0128677e1ccca324dba9320f2e018c70abe56b04e30c983e8cfd3cb05b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE2 10076 bytes
font_02_sfnt_off0000815d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815D 4324 bytes

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