Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b70e932c70d23a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-13 19:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfdeec3b22fa1e8c6552990468fe2f4e SHA-1: 238c3b7dcbc82ce8462e4488e05862c9b3147d5a SHA-256: 77b70e932c70d23a090c0911121c9dceb1d1d7cfbb890b786da7b5fc031682f7
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 of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the PDF is designed to lead users to malicious sites, potentially for phishing or malware distribution.

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.ru/wb?keyword=digital%20pressure%20switch%20smc%20manual
    • http://bogajajil.nicolecudzilophotography.com/uploads/1/3/1/4/131453133/5218580.pdf
    • http://kinivite.haywardsheatheagles.com/uploads/1/3/1/4/131452883/zulelepugex.pdf
    • http://gegajok.egsdmusic.net/uploads/1/3/1/3/131380213/linupujilebugonaba.pdf
    • http://files.jowolfe.co.uk/uploads/1/3/1/0/131070911/3548567.pdf
    • http://files.maxpotentialpitching.com/uploads/1/3/0/7/130775856/zatapadifaje-xugejonurix-sezup-xugobufawala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/ps2_bios_sounds_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9975/files/learn_python_coding.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2568/files/12674264449.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/12_class_psychology_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/6437/8022/files/centurylink_dns_servers.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/john_deere_x300_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/small_text_to_excel.pdf
    • https://cdn.shopify.com/s/files/1/0439/8641/9870/files/71239531691.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/basic_computer_knowledge_bits_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/wawojutibugukiwuwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/35787137117.pdf
    • https://cdn.shopify.com/s/files/1/0439/8078/3774/files/ancient_gold_dragon_5e.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_off000062a2.bin
980c4980341863889b79b2c94f248310357ac7a35950eff6dd00deeaecf799b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A2 5440 bytes
font_01_sfnt_off00007513.bin
20a9981ec720156ccbd0266398b0a85805d18de66391afe7ff2344a250ca46f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7513 10704 bytes

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