Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b141324f4f81ae5…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 04:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2198d56c25d797afc2d07f46c145f2f SHA-1: e388f71cd526299ea5f8243fc00003975e92805f SHA-256: 3b141324f4f81ae59dfb452a50f3880e3b2466eed9e25fe35efb4b2cebfec32f
150 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one prominently leading to a malicious redirector at 'ttraff.com'. This redirector is likely used to obscure the final destination and potentially deliver a malicious payload. The document body, though heavily obfuscated, appears to mimic a work attestation, a common lure for phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=attestation+de+travail+et+de+salaire+cnas+pdf
    • http://kafidaw.learnallthethings.org/uploads/1/3/1/6/131607062/d215e32dbb393.pdf
    • http://sejagaf.savinobrothers.com/uploads/1/3/1/6/131637881/41e86d2.pdf
    • http://files.corehomeinspect.com/uploads/1/3/2/7/132712383/4185509.pdf
    • http://favep.militarywivessurvivalguide.com/uploads/1/3/1/3/131383664/1805f.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/cost_accounting_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4260/files/juliw.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/vilep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/solopelok.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/tagaxorejuvujote.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/woramopuxiroba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7043/1125/files/biodegradable_plastic_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2988/8161/files/39200571041.pdf
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/66291280276.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/android_ds_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/minecraft_server_auto_restart_script.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_off00006679.bin
52a54c39b6efdf87f98e31d9ca1aefde9c4603013567e400d3cb376339048b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6679 5196 bytes
font_01_sfnt_off00007833.bin
f20f02968747bd5f445f79f4238beb69811cf596cd98c52b8f305aad6c4b44bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7833 12672 bytes

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