Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba99709f6cc9f4…

MALICIOUS

PDF

40.5 KB Created: 2020-08-28 01:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8856b1608d1a1191c7cea2f9a9f40e33 SHA-1: 629cb9f625b03674567d7ffeb9c8829ef8a51706 SHA-256: a5ba99709f6cc9f4caad0dc413772ee406865efcf7d26b6c13d4c26bfbbf83c8
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to a known malicious redirector, which is further supported by the presence of numerous other PDF links, suggesting a link farm. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The primary malicious URL is https://ttraff.ru/pify?keyword=project+management+textbook+pdf, which likely serves as a lure to download further malicious content.

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=project+management+textbook+pdf
    • http://mesated.flamintips.com/uploads/1/3/1/8/131872096/liluxaposixola-rekijepud-lejoguzevob-xefezituwikoj.pdf
    • http://files.parkridgeorganics.com/uploads/1/3/2/3/132303118/wuxona.pdf
    • http://ravuxana.authorkmdylan.com/uploads/1/3/1/4/131438188/e231ed2bfd4380.pdf
    • http://pudusimak.dedhamfps.com/uploads/1/3/1/3/131379362/8965981.pdf
    • http://files.gibimusic.ch/uploads/1/3/0/7/130775260/6651d059509b.pdf
    • https://cdn.shopify.com/s/files/1/0463/6635/9707/files/duik_16_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/81374228239.pdf
    • https://cdn.shopify.com/s/files/1/0435/6099/2927/files/7127957423.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0450/files/jabotozaritaze.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/7540786392.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8100/files/how_to_install_orespawn_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/math_book_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4778/files/kajedejijijiweril.pdf
    • https://cdn.shopify.com/s/files/1/0448/0755/3184/files/capillary_electrophoresis_download.pdf
    • https://cdn.shopify.com/s/files/1/0459/1462/0053/files/86542526865.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_off00005f2d.bin
ffd38a4595acdf592860a968f2e734049053e14b27fa0576d141285d10876251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2D 5616 bytes
font_01_sfnt_off0000723a.bin
ce5841be70f7be4c9d532effe924688e1b2b903292f67813d902403ca85ebc6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 10288 bytes

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