Malicious PDF — malware analysis report

Static analysis result for SHA-256 86806cb5eb92eb57…

MALICIOUS

PDF

85.5 KB Created: 2020-11-02 21:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1cf4ddd826e6d057e30e7644e35f41e9 SHA-1: 7dabbeb53fbac50e9f9d748d7389b43b8e408d82 SHA-256: 86806cb5eb92eb57227fa7a60467a23ccc7f16008d6e9887d96a34891ecb3176
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to direct users to potentially harmful 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.
  • 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://ggtraff.ru/wb?keyword=annie%20martell%20biography In PDF document text
    • https://dunidapakepew.weebly.com/uploads/1/3/4/3/134319263/3883537.pdfIn PDF document text
    • https://zasigusedorel.weebly.com/uploads/1/3/4/3/134386673/8685888.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/wevefitojabiwozabof.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/mawuraziwi.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://s3.amazonaws.com/soxukowotomaj/usps_zone_map.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/wijuxipupokodudixadunide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/goxerenigozi.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/pujotadepuxiwutefapan.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/chien_policier_belgian_malinois_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5736036-8fac-46e0-851d-c4db4027798f/glass_bricks_and_dust_sample_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/84506224938.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/ap_computer_science_principles_practice_test.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_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 5072 bytes
SHA-256: 5f8a7cee8d30573fb59a585ff66c6e892b3bfbffbde2ff20acaa654ea463b61f
font_01_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 12864 bytes
SHA-256: 6ab980cf7330bc2d06b3537bf26e8d8209bd8d77e04bc81c9b7b0db810f7a621
font_02_sfnt_off00013b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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