Malicious PDF — malware analysis report

Static analysis result for SHA-256 20acbce0bcb4411b…

MALICIOUS

PDF

52.1 KB Created: 2020-07-30 05:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03672e3be64f9fb8cbd4071ef0748c45 SHA-1: b3d2c99356851ccaaa280ef18ad11b4bf5c2980b SHA-256: 20acbce0bcb4411b5744821d35828e1d5eded9867676cd2b3e140d5c1ae4c21c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one prominent link directing to a known malicious redirector. The document body, though heavily obfuscated, contains keywords related to the linked content, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing the user to malicious infrastructure via embedded links.

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=abnormal+psychology+pdf+pearson
    • http://files.denicechenault.com/uploads/1/3/2/6/132695586/loferovola-zanuwuvo-rukaf-kafapij.pdf
    • http://files.iscebs-chicago.org/uploads/1/3/0/7/130740392/fetepofefomaj_jibipisatigo.pdf
    • http://files.melfoamacoustics.com/uploads/1/3/1/3/131384777/kekaneneb.pdf
    • http://files.simonmorse.com/uploads/1/3/1/4/131453636/5707778.pdf
    • http://files.kristysfineart.com/uploads/1/3/0/7/130775282/woxebajegitiwig-tubeluvo-sidemon-zibax.pdf
    • https://cdn.shopify.com/s/files/1/0436/9747/1656/files/94946700933.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/79577759701.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/sigizimozibamagazilezut.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/vomalogofawaxesisuzuzef.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/52286175041.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/68251524736.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/22907218716.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/masosit.pdf
    • https://cdn.shopify.com/s/files/1/0432/2715/2539/files/nusuvijiganeso.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/kobesolinezed.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2616/files/rikofubotatebipefixevogu.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_off000080bd.bin
d46d9828bd107d91f6246b6c65f75b299a4fc85f040ad89bd347d9291a957ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BD 5460 bytes
font_01_sfnt_off00009309.bin
9fc8b364b8792094f9950d40c5b0d8ac64eed34a327a435f5df8cbce8aacd0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9309 14964 bytes

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