Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe8d73fb7ce6ff…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 12:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 156981d553589b49da7844184c410172 SHA-1: a1fa029fd32261e4425ed8abc7bed8fca5090562 SHA-256: 8efe8d73fb7ce6ffaf50001f82d9e3a69904e6c772e504aaed906cd46edc951f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes text suggesting a lure related to an 'artificial intelligence book'. The primary malicious URL identified is https://ttraff.cc/pify?keyword=artificial+intelligence+book+by+rich+and+knight+3rd+edition+pdf, which is likely used to redirect the user to a further malicious destination. The presence of numerous Shopify URLs, while some are benign, suggests a pattern of using legitimate-looking hosting for malicious redirects.

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.cc/pify?keyword=artificial+intelligence+book+by+rich+and+knight+3rd+edition+pdf
    • http://files.finnsplace.org/uploads/1/3/1/3/131380005/zulezulatutu-teduduz.pdf
    • http://files.atousaraissyan.com/uploads/1/3/0/7/130740563/wofore-kuruvuxajekadel-puposurubag.pdf
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130740344/fa8b50ce.pdf
    • http://files.summerswebdesigns.com/uploads/1/3/2/7/132740423/3998897.pdf
    • http://files.genotac.com/uploads/1/3/1/3/131379894/b33ae4ab0d5.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/36492688703.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/66041627937.pdf
    • https://cdn.shopify.com/s/files/1/0436/6375/3369/files/project_problem_statement.pdf
    • https://cdn.shopify.com/s/files/1/0429/1071/1971/files/93000942084.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6667/files/matplotlib_remove_border.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/28381483863.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/lodovaxudowaluvivivovij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/totutojavakulirapudiwevoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6786/6265/files/81532694028.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004baf.bin
11dfb7a8e59ce2752a285e0aa738729a562e48ffec03efecd36168f884bb38a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BAF 5484 bytes
font_01_sfnt_off00005e45.bin
8198e9ad1b3e0bf70637006df7e1fabe2338e24a2807cfdc97c86d9adf1edf09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E45 5176 bytes
font_02_sfnt_off00006f20.bin
39a09e9b6da74cd3fa76966f2777091f3947cc0e8f25ffc551597769c2114b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F20 9720 bytes
font_03_sfnt_off00009054.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9054 4324 bytes

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