Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca64fd123e6eef6…

MALICIOUS

PDF

40.7 KB Created: 2020-08-05 18:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 558f75373b16693aaeb0e3b9e47793ea SHA-1: bda5fa0e41eab93ff2fc39e15fd2d32baabe19a7 SHA-256: 5ca64fd123e6eef6cb8970ab7db8e24cd24f7b8b241be3bf869afa65b2c02a0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious infrastructure, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains text suggesting a 'label body parts worksheet pdf' lure, likely to entice clicks. The presence of numerous external PDF links further supports 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/pify?keyword=label+body+parts+worksheet+pdf
    • http://files.stjohnlutheransherburn.org/uploads/1/3/2/3/132302913/9588273.pdf
    • http://files.wayneswindow.com/uploads/1/3/0/8/130874477/4514532.pdf
    • http://difafux.halfhuman.org/uploads/1/3/1/6/131607062/8cdf1bb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/jesibazepuxejokovuroxeve.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/63076549372.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/spoken_english_grammar_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/60364275348.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2257/files/72086719930.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/star_musiq_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/9553/1424/files/52129305654.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2567/files/49957147479.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/5555379131.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/mekidi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/bogivosubib.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_off000060ba.bin
7e419c88d98975da4f14c14c89d3c21473cdc7d6c5f9e008817798f86efcfe84
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BA 5468 bytes
font_01_sfnt_off00007361.bin
1ac8f3d181d3632ca4234d7807e99bd5edea85caee5f7ee1085cdc1d4ce1b1d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7361 10132 bytes