Malicious PDF — malware analysis report

Static analysis result for SHA-256 609daba8ca2393ee…

MALICIOUS

PDF

40.1 KB Created: 2020-10-29 07:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30319895596463cadd37848ca453a039 SHA-1: 5126578313dc8ff20d88ccddcca784d190f1bb15 SHA-256: 609daba8ca2393ee994a9f115e483e9a7314e21b9b2d2660ed6b0978c2866596
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another heuristic indicates a large number of external PDF links, suggesting a link farm. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking PDF links, likely to disguise the malicious intent. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious document, likely used as a lure.

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/123?keyword=juegos+de+patinetas+pais+de+los+juegos
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/ramojib_felibixetiw.pdf
    • https://xezinazilasiza.weebly.com/uploads/1/3/4/3/134319357/wobik.pdf
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/kapogedax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xumakomowi/1407838210.pdf
    • https://s3.amazonaws.com/napoledunadigo/nugudunuxi.pdf
    • https://s3.amazonaws.com/sifawekujiki/76552340865.pdf
    • https://cdn.shopify.com/s/files/1/0504/9155/6031/files/69365754758.pdf
    • https://uploads.strikinglycdn.com/files/a028324c-cb19-4b7f-83cd-567bca6c58a0/17135057206.pdf
    • https://s3.amazonaws.com/lokijuronig/kigepatujesisugafilijasoj.pdf
    • https://cdn.shopify.com/s/files/1/0479/4702/2492/files/36125426386.pdf
    • https://s3.amazonaws.com/dedinavesute/bravo_cucina_nutrition_guide.pdf
    • https://s3.amazonaws.com/bagisi/95809618598.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/28960203005.pdf
    • https://uploads.strikinglycdn.com/files/0e29c6f7-42ce-40e6-a507-9c51359d8ec8/gevopuwejipenebinijo.pdf
    • https://uploads.strikinglycdn.com/files/7ba950f1-f021-4394-914e-c4c5e878044d/ligelafezigusitewebam.pdf
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/zajamawebat.pdf
    • https://uploads.strikinglycdn.com/files/65876cc4-4af4-43e0-9a8f-e642c4fe0d1b/60540634191.pdf
    • https://cdn.shopify.com/s/files/1/0502/7669/6226/files/download_evowars_io_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0485/1620/2651/files/71212425706.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_off00005c25.bin
80b42656d1d73ddaf6eefe7ed0d93be7d9aa6fa6cc940ae4212c51a0996595ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C25 5096 bytes
font_01_sfnt_off00006d91.bin
b15e62f9dd6d9506f711d565b92a93640a65d4c087c705f06d0b3383b9dbb38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D91 11020 bytes

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