Malicious PDF — malware analysis report

Static analysis result for SHA-256 805c358b0f3b50fa…

MALICIOUS

PDF

39.9 KB Created: 2020-08-20 22:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6daf776da8df0235476091ae83e9eb1f SHA-1: b7b3c9e71e0102f63f90035ba60b2ca9863f3dd6 SHA-256: 805c358b0f3b50fa83900e6119894a631e0a5711c786f946c09280e9a2c6d544
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a redirector, suggesting an attempt to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'baby sitters club book 1 pdf' and a URL that appears to be a lure. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a redirector and part of a link farm.

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=baby+sitters+club+book+1+pdf
    • http://files.cruzing4photos.com/uploads/1/3/0/8/130874317/2675290.pdf
    • http://files.mickburson.com/uploads/1/3/2/6/132695356/ff456320780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/zasejarafi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/isometric_dot_sheet_a4_size.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5072/files/hunger_games_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/letuzidamusavifo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/32467757831.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/icy_tower_characters.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/41445418108.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_off00005e4f.bin
dacf04f50dee7cdcf94cc2959ff353b920c761c1b9e10ecc792e3d61e3fbac84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4F 5556 bytes
font_01_sfnt_off00007143.bin
41692541e09fa8ac506f2d27be1b92c2025a55f8e3ae611efbb87e23aa16200c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7143 10052 bytes

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