Malicious PDF — malware analysis report

Static analysis result for SHA-256 a962cd5c40790e74…

MALICIOUS

PDF

46.2 KB Created: 2020-07-30 15:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be30b358c692fbf09fa1649c4487b499 SHA-1: 1d3624162f190e13751c9e360a45f6d75d66ea43 SHA-256: a962cd5c40790e748c843813a41dd0478496f793f2bf5736da4f752b0a31e125
150 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or heavily obfuscated, but the presence of numerous links, including one leading to a redirector, suggests a phishing or malicious redirection attempt.

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=bacteria+definition+biology+pdf
    • http://files.stefandolidis.com/uploads/1/3/1/3/131380547/tilupiba.pdf
    • http://files.therockwm.com/uploads/1/3/1/8/131856039/b2ef73c869e96.pdf
    • http://files.70slovewine.com/uploads/1/3/0/8/130814298/rubusuvu-wovabigunilegab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/31806220560.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/5740818904.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2589/files/vosesapaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8491/files/gajedidamipuwaluna.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/busafotofamadexemadigo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/89480648355.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/wiwavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/jolibilopitolikidixal.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/55315039855.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/bizogaxalulu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/jidelubovare.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/1/0432/3239/5426/files/busafotofamadexemadigo.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077fa.bin
d9ea48fa90c810449b24f1f563157a0890cc1c98f8caa2d998bcb4618c35736f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FA 5224 bytes
font_01_sfnt_off000089ca.bin
a7ef948b7d501c4ac208b9febfd4d945160b465bde9985496e80eeecbef5b72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CA 10008 bytes

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