Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd3a2045e08c93f…

MALICIOUS

PDF

55.3 KB Created: 2020-07-27 15:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa4d8dad9ee842f6d9032f462a6552b SHA-1: ea90e66ca59ac87bb80e8af0b9a77f13ac65d2f2 SHA-256: 3cd3a2045e08c93fe9e8228e577e99606c48168b9a2b0970f384565563620647
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is `https://ttraff.com/pify?keyword=amor+liquida+zygmunt+bauman+pdf`. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous links, including one pointing to a known malicious redirector, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=amor+liquida+zygmunt+bauman+pdf
    • http://files.talachedairygoats.com/uploads/1/3/1/0/131070712/tudezakuf-dejura-finuvubu-vuzogub.pdf
    • http://files.smwunlimited.com/uploads/1/3/0/9/130969313/7404020.pdf
    • http://files.derekwheaton.com/uploads/1/3/2/6/132682934/a5cbf986bb60.pdf
    • http://files.stpaulpensacola.org/uploads/1/3/1/1/131164160/cc9e0a64.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/92819584921.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/67855581624.pdf
    • https://cdn.shopify.com/s/files/1/0429/7759/1449/files/25856209987.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/90946104527.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/84694269091.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/38650505078.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/kodusosevipovinewire.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/falodegod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/rilodisewadew.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/getebirebaxewelavexelulok.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/zelusos.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/wiluduxidukuzuzulevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/titaruwepagafebep.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_off00009aef.bin
2e92366cc26af9db259b9c78b78d1e521fc3a78e0b2ac5a4f8fcfbe149ab3cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEF 5356 bytes
font_01_sfnt_off0000ad06.bin
f348649f20b1bd9571425ca90741a7cc12df0a7cd45215ea19668a43a8b738b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD06 10008 bytes

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