Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99728d3d98c8b53…

MALICIOUS

PDF

52.3 KB Created: 2020-08-22 01:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b97495b08b67499affe762af92b35d SHA-1: 00de78bc3cf7dd2f91e37d1ae34d2d08dc04282c SHA-256: c99728d3d98c8b53d23369fee57fab7948b90c9fcf6c322c2e236b3505ad7c8d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical redirector link pointing to ttraff.cc, which is known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Allahabad state university llb exam date sheet' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links further supports the SEO link farm heuristic.

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.cc/pify?keyword=allahabad+state+university+llb+exam+date+sheet
    • http://files.jeujeulafoille.com/uploads/1/3/1/4/131453595/7e0ed67c8c.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/2997/files/5609670357.pdf
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/78882760242.pdf
    • https://cdn.shopify.com/s/files/1/0436/5742/9145/files/data_analysis_with_r_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/roxanuwesuleg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/50715933094.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/18750020260.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/centigrade_to_fahrenheit_conversion_chart.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f68.bin
ff96a0a8ae31b2cfaff23a9e700b836c0fc7ff0dd5c8f1dcc5eb39ab289c4342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F68 5424 bytes
font_01_sfnt_off000071a7.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A7 3720 bytes
font_02_sfnt_off00007d0b.bin
8cd0b1ac24b7f5b3d0bdce310cd043aee126ecb624fecb77243c6f0113dba91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0B 14784 bytes
font_03_sfnt_off0000aa93.bin
87522dd4bb2fe6d3d0f4a0e9ecf2a59e7a43aa36d8c5b57f99349f9bd712649c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA93 7492 bytes

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