Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c24ac91025174fb…

MALICIOUS

PDF

43.8 KB Created: 2020-09-05 02:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81483ccac78f2eda5c2106e3cd00631 SHA-1: cdf567de367ab29331b95fb1d345d9f7ba99b303 SHA-256: 5c24ac91025174fb24d664ee8d94863cc31e403fef969590b2cfbc6c83c991ca
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=colored+pencil+brush'. Additional heuristics indicate a link farm structure, suggesting an attempt to distribute malicious content or traffic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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.me/wix?keyword=colored+pencil+brush
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0df15e_4ae50916826f48509a203e2f9c777e18.pdf
    • https://static.usrfiles.com/ugd/35f767_33e22b63641f4f079541d45c83ee58ff.pdf
    • https://static.usrfiles.com/ugd/28146e_7d06a1de7c584ed3873d72a8d9fa6523.pdf
    • https://static.usrfiles.com/ugd/18122d_8ebe86bb8b834928859196d344a8e6a8.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_6d2e2e03427f40dc87c8fdb88ef03351.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/61487980393.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/naxudujatolot.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/aoac_standard_methods.pdf
    • https://cdn.shopify.com/s/files/1/0439/6810/2558/files/7243702295.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/95852421003.pdf
    • https://cdn.shopify.com/s/files/1/0470/8879/5806/files/integrated_reporting_training_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/julejiwakazexepupivoles.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/95779217276.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_off000060c7.bin
6602dc6072bcd642c7e59de727e03a999bea43b7f5b7e44f3c7067f49333f9ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 4916 bytes
font_01_sfnt_off0000715d.bin
9ee5622b7b6890afa132a8249eeafc27b3d1be3b8c08cc7e210e9dafc84b1012
pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 10408 bytes
font_02_sfnt_off000094c0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x94C0 4324 bytes