Malicious PDF — malware analysis report

Static analysis result for SHA-256 6289f8da16333366…

MALICIOUS

PDF

50.0 KB Created: 2020-07-25 11:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad00bf367206b21b3557c764b070b15 SHA-1: 5fed51d36898f789e8da83ecdbd22fd23503e436 SHA-256: 6289f8da16333366000aa56f44b9bd53c2b310b6581d1d2d54eafb232bb3b07b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to external, potentially malicious, sites. No scripts were extracted from this sample.

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=mozilla+firefox+focus
    • http://files.ortegaartstudio.com/uploads/1/3/1/4/131453610/xuwiwunu.pdf
    • http://files.varsity-prep.com/uploads/1/3/0/8/130874544/4f648.pdf
    • http://files.carolgrice-curran.com/uploads/1/3/0/9/130969498/f3592f10080e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/xoriraza.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/solaguzodifosokokatatile.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/60465783772.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/17716211898.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/feromarimozoruwizaguwu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/ludodilomipetitep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/66647998734.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0432/1941/9291/files/mefojapilosatizamekek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/segebuwasisubokaxi.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_off00007204.bin
838f775200a552620fd04b549336b54436a9b9e06fe7ad709a9ee0da9b2e424b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 4692 bytes
font_01_sfnt_off0000821c.bin
dee025dbdbef5a212a0bbce191967568f890485203f18dacb02963ee270d9ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821C 10668 bytes
font_02_sfnt_off0000a5d5.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D5 16164 bytes

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