Malicious PDF — malware analysis report

Static analysis result for SHA-256 4150257d2ac0f8d2…

MALICIOUS

PDF

42.2 KB Created: 2020-08-07 12:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58eb214cdaccd3fc3e1d336d59a5ede5 SHA-1: 05684d129fb45a4c8fff865caaa895710e3c4645 SHA-256: 4150257d2ac0f8d2c6b6b78eb504e744dcc326ba982f01a9f1f37da7f2d850ef
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL and other URLs that appear to be part of a link farm. The primary malicious URL is a redirector that likely leads to further malicious content or phishing pages. The file is a PDF generated by wkhtmltopdf, suggesting it might be used to disguise malicious links within a seemingly legitimate document format.

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=diabetes+type+2+pathophysiology+pdf
    • http://files.r-u-ntrtnd.com/uploads/1/3/1/4/131413905/sibesadega.pdf
    • http://files.rijkewijnen.nl/uploads/1/3/2/7/132740606/defiguronir_zekepivogaf_bojimezuwuj_nipana.pdf
    • http://files.jam5k.org/uploads/1/3/0/7/130739892/wixidunaleda_gutoxoroj_lozumad_fagizejiz.pdf
    • http://files.teamblendedbeauties.com/uploads/1/3/1/0/131070590/vojukup.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/xivabepasesegumiwuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/unfinished_gun_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/9893373448.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6226/files/26391632371.pdf
    • https://cdn.shopify.com/s/files/1/0437/7581/9927/files/takafelofojor.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/sibixemu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/71195478029.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/wewigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/32917295638.pdf
    • https://cdn.shopify.com/s/files/1/0454/4741/3910/files/character_traits_foldable.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/pivixonufuj.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_off00006657.bin
4712f09819bb61f5e76ee9fdd8984dfa7433dd980ed06cb37676d31a11a04fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6657 5580 bytes
font_01_sfnt_off0000795e.bin
27d1a1afeaa02eabad72c13011ea87508579fc1b86e4b91dfa1d3aa97475cef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795E 10196 bytes

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