Malicious PDF — malware analysis report

Static analysis result for SHA-256 0023c73077206fa5…

MALICIOUS

PDF

40.9 KB Created: 2020-09-05 20:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f305cb1e58438eedb93f5823eb714d9d SHA-1: 203eed8ab07745ba69342c3afd516dfd34f3be28 SHA-256: 0023c73077206fa565bde650d5393847270f9a6ac18b94e05edfa36c80bd7fc0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF document contains a mass of external links, including one pointing to a known malicious redirector. The document body, though partially corrupted, contains the text 'Label printer template online' and the malicious URL, suggesting a lure to trick users into clicking the link. 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.link/wix?keyword=label+printer+template+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/degivaronividep.pdf
    • https://cdn.shopify.com/s/files/1/0465/0772/0854/files/84639826647.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6324/files/duwivig.pdf
    • https://cdn.shopify.com/s/files/1/0437/6032/0663/files/invitation_letter_for_embassy_template.pdf
    • https://cdn.shopify.com/s/files/1/0460/7603/5236/files/android_17_mir_sweatshirt.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5845/files/pascal_s_triangle_java.pdf
    • https://static.usrfiles.com/ugd/7ff653_2f3efce1d43e4dc5949e3f3ea91fd5b1.pdf
    • https://static.usrfiles.com/ugd/e8dba5_c79319f832cf49318fdc979a45f681b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf4b339f1a4347c79ef99a2861765bba.pdf
    • https://static.usrfiles.com/ugd/906e9f_1982e655a26a4618b8d28d6f08d8f5c8.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_c358945ac1444a2f9974ed8e374f3814.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/zaraxur.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/66140413823.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_off0000649a.bin
f089cf1667dccf231249a90cd0725ce11edb0027114c838e7edb409b78b9c94f
pdf-font-stream PDF embedded font (sfnt) at offset 0x649A 4868 bytes
font_01_sfnt_off00007510.bin
b557eb24e35c2c2a998f35bdc38d1c3bd8c2e4831988556798acf3a7e0dbf213
pdf-font-stream PDF embedded font (sfnt) at offset 0x7510 10000 bytes