Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b55c8ab60059b9…

MALICIOUS

PDF

40.0 KB Created: 2020-08-22 16:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea409d82759853794f31a9c27ebe4154 SHA-1: 5681e22b1692faa0dbed32146c5e30f0c2dc22d8 SHA-256: 54b55c8ab60059b99de95932fb875fd50ba617dfbc5fcaafb144299585b4ffd5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a primary malicious redirector URL, disguised with text related to 'Texas dmv test questions'. The ML classifier strongly indicates maliciousness. The primary malicious URL is https://ttraff.com/pify?keyword=texas+dmv+test+questions+and+answers, which is likely used to redirect users to a malicious site. Several other PDF URLs were also extracted.

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=texas+dmv+test+questions+and+answers
    • http://juwugenux.beyoustaytrueprogram.com/uploads/1/3/1/6/131606227/53570.pdf
    • http://files.topraise.org/uploads/1/3/0/7/130739488/424f41093879a3c.pdf
    • http://files.worxforms.com/uploads/1/3/2/6/132695517/33757122807b873.pdf
    • https://cdn.shopify.com/s/files/1/0434/8290/6789/files/malaria_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4452/files/jalul.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/37393362399.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3248/files/nivunore.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2695/files/curriculum_vitae_template_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/gexavijitugovixinituwipe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/regression_analysis_articles.pdf
    • https://cdn.shopify.com/s/files/1/0430/4633/8709/files/15959857081.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9287/files/9429321823.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f27.bin
ade221a767495467dd02143852a2e84fd1d4268ad751dbd7ffc4f8256b9ea7c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F27 5232 bytes
font_01_sfnt_off000070f2.bin
b3e749070e8e5020ead6b89cc898486c22d644be4819d5a21b7beb2f2f3d3bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F2 10120 bytes