Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2137aefee8cb702…

MALICIOUS

PDF

91.4 KB Created: 2020-08-29 19:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 693514fa50b7b3a1dba97eb1b470008c SHA-1: 24472ef39c6285c8420240881afcd4fe7be9b4e0 SHA-256: f2137aefee8cb702db808b922c4b3c2f97f11dd8b301569bc34799f785377650
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL, https://ttraff.ru/wix?keyword=mau+%252F%252Fwww.google.com%252Fdevice+em+qualq, is a redirector. The document body contains obfuscated text and a reference to the redirector URL, suggesting an attempt to lure users to a malicious site.

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/wix?keyword=mau+%252F%252Fwww.google.com%252Fdevice+em+qualq
    • https://cdn.shopify.com/s/files/1/0463/3634/4226/files/36336152928.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6026/files/letter_of_recommendation_template_for_employer.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/pakavazimudedetoto.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/59813130401.pdf
    • https://cdn.shopify.com/s/files/1/0448/2295/4141/files/kumon_reading_workbooks_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1615/1462/files/chinese_calligraphy_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/75103522174.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5442/files/179173196.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/rotuzed.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/kogurivipemofewuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9013/files/90002640237.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/tarsal_bones_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/37221276792.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/85781331417.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/rinubirimiperajozofeza.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_off00011e52.bin
965da7ff86d4bcab94b2e3a4989af8b25cfaef43bb9ed0f508f6f698f62fb44c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 5336 bytes
font_01_sfnt_off0001308a.bin
641e4f6dd5e1f2f61da91daa8d2150b5a9fd4b01623a308abfda4b9486908447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 14964 bytes

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