Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc774bfac1da2c8d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-02 14:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8fa1278f18f70474c5e976c2b458770 SHA-1: b7928292e4549369a9c137440798ed7aeef0bc9a SHA-256: fc774bfac1da2c8d4792b55d08c2c5dd076be842b907e780e9d248431a9f2d26
128 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for an 'attendance sheet pdf'. The PDF also exhibits PDF_SEO_LINK_FARM behavior, embedding numerous external links, one of which is a known redirector. This suggests a phishing or redirection attack aiming to deliver a payload or lead the user to a malicious site.

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.ru/pify?keyword=attendance+sheet+pdf
    • http://files.norkarussia.info/uploads/1/3/2/6/132681513/e64a9bbed3.pdf
    • http://files.weallloverice.com/uploads/1/3/2/6/132696128/8528865.pdf
    • http://files.rockynazarene.com/uploads/1/3/2/3/132303269/2686599.pdf
    • http://files.crystalcoastbooks.com/uploads/1/3/0/8/130814605/6796572.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/xakituvabugopuxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/5816336985.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/380528628.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/ladiletumiwuxovazepag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/jorolipezubenuza.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/31584842549.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/20859174306.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/tigasisogijijitamuxewufa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/jaxewovile.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/vagexov.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_off000066d4.bin
6cd41465aad47f9a0092e97144b7e29da334e92cc89c8467806d89bcdd68742b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D4 5104 bytes
font_01_sfnt_off0000783a.bin
b1ae25fe4a3969a61ddd10c9f19f99027f2b13f5daeb30e121399fd3b1773e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783A 10052 bytes

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