Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b662c31b8f2dd77…

MALICIOUS

PDF

34.3 KB Created: 2020-08-09 09:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0b54934de9ea97a16f1b17f3bda46ba SHA-1: 7b81c40b89fa89aa938a9f33c3dc6986fa1ec876 SHA-256: 4b662c31b8f2dd77b201830223e6a20eec0a7fc9329b76e36cab453ecde09296
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Seismic design of steel structures mazzolani pdf' and the URL 'https://ttraff.ru/pify?keyword=seismic+design+of+steel+structures+mazzolani+pdf', suggesting a lure to download a PDF disguised as an academic document. No scripts were extracted from this sample.

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/pify?keyword=seismic+design+of+steel+structures+mazzolani+pdf
    • http://files.baraniakenterprises.com/uploads/1/3/1/4/131453026/85126.pdf
    • http://wowugawa.nolanwhitephotography.com/uploads/1/3/2/6/132696212/3fa6f15fe9b.pdf
    • http://files.danarkelly.com/uploads/1/3/0/8/130873875/paguninifodopig-jekawigekilag.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/64738773941.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/duxonovinaruzuzatisaforof.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/estrategias_aprendizaje_cooperativo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/xisij.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/45581750968.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/jamovodapikumaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/21514218333.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8833338052.pdf
    • https://cdn.shopify.com/s/files/1/0428/4999/2870/files/wild_horseradish_stardew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/71893376514.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/oxford_english_grammar_book_for_class_3.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_off00004805.bin
7cb8580c4bd39ba2b08cc0607ac56d61012c230a4ac39cb41913124c4af6202b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4805 5628 bytes
font_01_sfnt_off00005b23.bin
4052ae1ef7d1b9353a37f358e0b5b5a901f44991c4c998c298a17ade497074f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B23 9744 bytes

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