Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a1e89257171316…

MALICIOUS

PDF

41.3 KB Created: 2020-07-31 14:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e70032d848fbd61e379519251c57e41 SHA-1: e37b54c4748b2a98aba10c6ea159dbfe3c69c35d SHA-256: 89a1e89257171316d6c375501f063d67e4be28c69765123ea6501bc9b67d8fa0
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'algebra questions pdf'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=algebra+questions+pdf+by+abhinay+sharma
    • http://files.jeremywolin.com/uploads/1/3/0/7/130776499/136543.pdf
    • http://files.shirehistory.org/uploads/1/3/1/4/131437041/1e6cbc3e986abf1.pdf
    • http://files.equivistacoaching.com/uploads/1/3/0/8/130814208/5ff16334be0d498.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/gilurosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/2194780237.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/77537935673.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/99119297308.pdf
    • https://cdn.shopify.com/s/files/1/0429/0360/1308/files/dukudogajoxejowivadakalu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7154/files/88781471513.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/64471771166.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/tasegevefapijufuzogose.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.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/
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/77

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062cf.bin
7cb6a270fdcb7c144d72d8f005dad3bd6bf20d2e41df29c1868ad723e69d67a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CF 5696 bytes
font_01_sfnt_off000075f1.bin
7950528747814514a71de736840b96c8248b5a3bf7097e68eddd54a010952bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 10104 bytes

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