Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a725a0ea62534ee…

MALICIOUS

PDF

62.2 KB Created: 2020-08-06 13:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10688302aa0a6d64516f00d1a0a779da SHA-1: 0e049ae2e2ac8093ba03427ec64b242465eda0f0 SHA-256: 9a725a0ea62534eebe11ab2d1cfd26a91168e5a0a2c8249fe3b86342e6abd855
128 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a download for exam papers. This is further supported by heuristics indicating a malicious redirector and a link farm designed to appear as legitimate content. The document body, though heavily obfuscated, contains the same lure text and the malicious URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bitsat+question+papers+2020+pdf+download
    • http://files.gourmetgarlicgardens.com/uploads/1/3/0/7/130738875/suxoreditiwone.pdf
    • http://files.timwarnerlab.org/uploads/1/3/0/9/130969714/9903433.pdf
    • http://mokimidil.blumenstiellab.org/uploads/1/3/1/4/131452883/danuf.pdf
    • http://files.kingfisherpbs.org/uploads/1/3/0/9/130969452/jejosetopivurup.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/24654445420.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/pebetij.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/jozekoxosusisowibija.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/amyotrophic_lateral_sclerosis_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/wizemamez.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9870/files/81048497809.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/indesign_smaller_size.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/largest_palindrome_product.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2653/files/73021635150.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3718/files/jatezujiliwugagoni.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/67075399799.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/street_address_in_usa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/doxazubatoz.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000735f.bin
71af84bb7ad429539f099e14ca916e376411cb43680259a115fad43000a5ba4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735F 5460 bytes
font_01_sfnt_off000085fd.bin
6eef5644951ae33119e1a3e7447324c9bf8ae6c49bd52c740dba1e73b1db2e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FD 5648 bytes
font_02_sfnt_off000095bd.bin
69e6e659080c6edcc57ce8f99d6e4fcaf7dda32e04d21e04d7d62694bc9c500d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95BD 10396 bytes
font_03_sfnt_off0000b936.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 16224 bytes
font_04_sfnt_off0000ce83.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 4324 bytes
font_05_sfnt_off0000dc84.bin
198be8c9771d3e98ef93488be7132f55683bf0dc6a4b62b8e17640e041903154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 3420 bytes

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