Malicious PDF — malware analysis report

Static analysis result for SHA-256 d153bbf03c6f4889…

MALICIOUS

PDF

40.0 KB Created: 2020-08-13 13:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 983c616590870b62eb9a3fb5fc64466c SHA-1: 49f8fc4eccbf6efb8bf2484769e3c7c88a072b07 SHA-256: d153bbf03c6f48898bef4ca205f2c77b22f724559a98fcb8fe93445822b50630
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'Kinds of sentences according to structure worksheet'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.ru/wb?keyword=kinds%20of%20sentences%20according%20to%20structure%20worksheet
    • http://files.passitkit.com/uploads/1/3/1/0/131070911/ae4e3.pdf
    • http://files.siakas.com/uploads/1/3/1/8/131856009/0d7fbd20959.pdf
    • http://files.tom-burden.com/uploads/1/3/0/9/130969498/givijerabikufov_gomanex_luviwiv.pdf
    • http://files.kaylindy.com/uploads/1/3/1/3/131383297/juled_manigupifawov_pubonub.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5164/files/65758640816.pdf
    • https://cdn.shopify.com/s/files/1/0431/8144/1181/files/manfaat_binahong.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/38161145221.pdf
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/16140040472.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/81945871817.pdf
    • https://cdn.shopify.com/s/files/1/0435/2586/5636/files/80121660213.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/47354561179.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/34533360318.pdf
    • https://cdn.shopify.com/s/files/1/0438/6314/6656/files/applied_management_science_lawrence.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/bridging_the_gap_13th_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0431/1741/2501/files/32103121505.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_off00005e21.bin
b20bcf13684bd74fed4ff1e1da5202e319f41132286d53c98a20cb9f8b7b4879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E21 5376 bytes
font_01_sfnt_off00007071.bin
ba6012ae2f4bd1bb8179fc57a71bf4e9e78153c3fbcaeb01ea9e4a520d56dd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7071 10024 bytes

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