Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1278a3976dd141…

MALICIOUS

PDF

36.9 KB Created: 2020-08-25 01:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad86b70ef08da60b68c8594a76166f72 SHA-1: 32952a2e4923909cf67c2072126ec1a9b50b8447 SHA-256: 4a1278a3976dd1419eb0595c71076e9e6d0f81abcec743cadd813fb19565ff54
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented to the user with a lure related to 'app store free android games'. The file also contains a PDF link farm heuristic, indicating it's part of a larger SEO-based distribution effort. No scripts were extracted, but the presence of a malicious redirector is sufficient to classify the attack pattern.

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=app+store+free+android+games
    • http://files.vallemagica.com/uploads/1/3/2/7/132710779/tofotora_pofav_gatiregilanu.pdf
    • http://kesaju.worksbysage.com/uploads/1/3/2/8/132814500/raxobuzukosu.pdf
    • http://files.ishinewithglory.com/uploads/1/3/0/8/130873943/6118db59570b5f4.pdf
    • http://files.mayamoralesofficial.com/uploads/1/3/1/4/131407435/tuwef-xiwogijesujidu.pdf
    • http://files.realestate-swla.com/uploads/1/3/1/1/131163834/81885.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/77392959943.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/pdf_to_spreadsheet_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1784/files/vubepetisukodifagimuli.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/writing_equations_from_graphs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4098/0643/files/hulu_live_channels_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6939/9452/files/xelikudefubow.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/vatorukuveza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/kosefanojogop.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/gokafolonap.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/fawirorawutepaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/69264959984.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_off00005337.bin
a1b29f94c4e00612966b65f1135c081bb1ef9909ddf29669c8e8cdcf29ff51a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5337 5320 bytes
font_01_sfnt_off00006535.bin
c1004280332ef491925387bedbab5fb650032ead835e76c31b913b5965db2022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 9780 bytes

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