Malicious PDF — malware analysis report

Static analysis result for SHA-256 73598f3472ba9b37…

MALICIOUS

PDF

45.1 KB Created: 2020-08-29 17:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55309749b1b882f2b59c315df57b31d SHA-1: 6e734f81a5db7f07c0bc27852a47f18d314ae4ad SHA-256: 73598f3472ba9b3742ddb0a88dea6c8049599f5fea544c823cad4eaedd5a1697
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.com/wix?keyword=identidades+trigonometricas+ejercicios+resueltos+4+eso, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure for educational content.

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/wix?keyword=identidades+trigonometricas+ejercicios+resueltos+4+eso
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d9bc30d8345c4a9bab3030cf77febca1.pdf
    • https://static.usrfiles.com/ugd/07625c_ed621d3c09f840898914e59ad1c710dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5e07f0d016147b8b28ddc512b72ef60.pdf
    • https://static.usrfiles.com/ugd/b8c837_6573bfaeffc24253bee62bc962877ac2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0efc339b98e747a992879437c9e52293.pdf
    • https://static.usrfiles.com/ugd/b8c837_69260b6ea10e4c69897655aa39b009b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a2f4146a234ae1ae9fed2b43e13a17.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/cursive_writing_practice_sheets_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/funuvusotinepinorevo.pdf
    • https://cdn.shopify.com/s/files/1/0457/4583/2092/files/jadijeliwanilumodunenuku.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/how_to_hack_snake.pdf
    • https://cdn.shopify.com/s/files/1/0445/6205/5332/files/anticipatory_bail_in_up_notification.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/sexivewulipogi.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_off000059a2.bin
365f301db83ff5ee354f73788967b808590d495337622b85b647468ba5f5a61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59A2 5360 bytes
font_01_sfnt_off00006bc9.bin
d9a70cfc41150340ae581598e8198f36f86b066dd1095f46a43a82433b52b5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC9 10992 bytes
font_02_sfnt_off00008fe7.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE7 16204 bytes

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