Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef11aa5d790092e5…

MALICIOUS

PDF

70.6 KB Created: 2020-07-23 20:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 926a140c7cda0b51444ec6f782e50284 SHA-1: 2ede8a970707327a7dfa63995abdee1c688723f2 SHA-256: ef11aa5d790092e53d4bbe2b04ff291c6a0ed4dc492944a1f04f67e1ecc99112
128 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text suggesting a 'free grammar checker' lure, supported by the 'SE_DOWNLOAD_BUTTON' heuristic. The primary malicious link is 'https://ttraff.ru/pify?keyword=instant+grammar+checker+software+free', which is likely used to redirect the user to a malicious site.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=instant+grammar+checker+software+free
    • http://files.westvillageclothing.com/uploads/1/3/2/7/132740838/906577fcb.pdf
    • http://files.kincoastphysio.com/uploads/1/3/1/6/131636843/samumelogogedalo.pdf
    • http://files.jpvahelloworld.com/uploads/1/3/0/7/130776399/6974392.pdf
    • https://cdn.shopify.com/s/files/1/0429/6671/2479/files/498832207.pdf
    • https://cdn.shopify.com/s/files/1/0435/5178/5109/files/59661568194.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8979/files/97269899813.pdf
    • https://cdn.shopify.com/s/files/1/0435/8671/5805/files/32693339985.pdf
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/3753539253.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/vabowuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1701/files/7782281423.pdf
    • https://cdn.shopify.com/s/files/1/0428/6539/3820/files/72955683436.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/91604033195.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/30592027207.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/kubijubutepuxexozamaj.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_off0000d6e5.bin
49c71e326e6bb065b6b65d7cba0a02c6ff15567d9ea95f9ec48399afd3d546e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 5096 bytes
font_01_sfnt_off0000e80c.bin
c80d81ac1a09f80ce311b7cf6a4f9a909a1a57aab0b4be8e2fa1832725878e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10768 bytes

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