Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fb5a6032aaaa3a…

MALICIOUS

PDF

48.4 KB Created: 2020-08-31 09:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47522ce714dec6d4d568c06337537d74 SHA-1: d743ce31422169479078df2407d8cb6c8f887c23 SHA-256: 33fb5a6032aaaa3aea3cbf5709e1e132f028ae47e0d4132412a57ef721120493
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, identified as malicious. This redirector is part of a link farm, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=clay+soldiers+mod+1.+6.+4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8127dd_946cef3ff5b1493e927a89c33c4d2bd2.pdf
    • https://static.usrfiles.com/ugd/1f2646_13470d43d4d642ef83a89bb55a26a245.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43635ec5705449cb025bf6588570ddf.pdf
    • https://static.usrfiles.com/ugd/b8c837_765b813be39641e098dfb3974e2d5643.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8357/files/58639940741.pdf
    • https://static.usrfiles.com/ugd/e8506d_d44bb210c1e94f35ae340ea69ad4cb0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef1531130b8740b3b675943f0c4e103c.pdf
    • https://static.usrfiles.com/ugd/5ecadc_620e3656bae5432c8612ce922bf91260.pdf
    • https://static.usrfiles.com/ugd/e1c37d_cb8558f6f6194634a7cafe6abdc6517d.pdf
    • https://static.usrfiles.com/ugd/b8c837_49de9b72dd4b4994967c082c2c7f984e.pdf
    • https://static.usrfiles.com/ugd/67e251_94ba11a2cec4452f803039fb9168b30b.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068eb.bin
252c6047235f3f10d962ab132018725b545bbdf041e7b58acaab12d4a44cb4dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EB 5304 bytes
font_01_sfnt_off00007af2.bin
b18151230b051f307a30ba7e703c07f3ab83a63cc23f985ae51d071e58e06111
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF2 10360 bytes
font_02_sfnt_off00009e89.bin
6f41d85279102efce3c4bd26fddb767baf9b68a4f55e239fba9bedc2a2d3b953
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E89 16064 bytes