Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa222a0a2853e7f…

MALICIOUS

PDF

36.2 KB Created: 2020-09-03 03:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77a744bd2989712096f155a29ed52fd5 SHA-1: f86745da70830adfb158c8f04f30fc7bb8021ab5 SHA-256: 5aa222a0a2853e7fd473c6c610e0cd605eb0f2b3bb1e274c0a3655449a78506b
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and is flagged by an ML classifier as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be designed to trick users into clicking it, likely to download a secondary payload. The presence of numerous links suggests a link farm or SEO poisoning attempt to increase visibility.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=checkpoint+vpn+capsule
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1ebe14_a4a4b7678c084dd1a220c3fa5b3df1c0.pdf
    • https://static.usrfiles.com/ugd/7a11b0_457adb772fa841a68a0716a9d32ab426.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc3e5999a7de4cafb3d8ed7e44dd68bf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6133/6471/files/vudedegaxuvonobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/solawazomuzelidimon.pdf
    • https://cdn.shopify.com/s/files/1/0435/9313/8333/files/79003221047.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/bobinage_d_un_transformateur.pdf
    • https://cdn.shopify.com/s/files/1/0432/9101/7374/files/jowivinomiwobimi.pdf
    • https://static.usrfiles.com/ugd/6846fe_8761b93182f74024b64a0eced8b9091d.pdf
    • https://static.usrfiles.com/ugd/45fd81_2465c5f2e864425e9010a945da0be1f2.pdf
    • https://static.usrfiles.com/ugd/289c5e_2747f0d8705f49209301ecdd41d9052e.pdf
    • https://static.usrfiles.com/ugd/1acd69_a559f8ce3eef42588bb96456a2091101.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043c2.bin
1bfb269398bce323ddea03cbbc09d26030cf37fbbb7ed53ae50360e94f13920b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43C2 4952 bytes
font_01_sfnt_off00005496.bin
8e0240fa1c3b463af8d690d69b2d3824b8b789800cd27980999e81a353567ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5496 9784 bytes
font_02_sfnt_off0000760d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760D 4324 bytes

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