Malicious PDF — malware analysis report

Static analysis result for SHA-256 101a9344fa3d9e1f…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 03:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfd45f5f099b48eb1f525171e65cd4d0 SHA-1: 3715e55db80823ac6c049fb7d8ab86960eac0024 SHA-256: 101a9344fa3d9e1fb6dd22b8bcdcb5d11699600267efc56656eaf4ed0f7614be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one prominent URL leading to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting a malicious site. The presence of numerous other PDF links further indicates a link farm or redirection strategy.

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.com/wb?keyword=the%20bondmaid%20pdf
    • http://dinifula.sueannecelebrant.com/uploads/1/3/0/7/130776791/8247912.pdf
    • http://files.rtgdanceministry.com/uploads/1/3/2/7/132712198/bef973a520cb46.pdf
    • http://files.theprimitivelane.com/uploads/1/3/0/7/130775215/6024049.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/64419121272.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/monarowibaveborabad.pdf
    • https://cdn.shopify.com/s/files/1/0438/6550/5952/files/d_d_5e_barbarian_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6580/files/acca_f6_taxation_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/32781768761.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/86589266902.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/mitobujibanexemapofuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/vapile.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/binary_options_trading_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/28115621423.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/vavanutibo.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_off000062eb.bin
abfc1c10e5dcde31b2b3878109b73313314d319bf0c9aae849a52139a09efb9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 5064 bytes
font_01_sfnt_off000073f6.bin
be8a9f449277c9c0c7f5ccc65f8fca4023b1eb4470cfd35649f5367165e3cc10
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 10900 bytes