Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81ae3456604cbde…

MALICIOUS

PDF

47.4 KB Created: 2020-08-06 15:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b7d9f49304d24cbd2a649d7433f374 SHA-1: f2da770e739f832bddc1ffa2cc9e69ea2d693b36 SHA-256: b81ae3456604cbde16a53ba9c994318b6b7a87065b855e65480668912682f9ff
128 Risk Score

Malware Insights

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

The PDF contains a mass link farm, with one critical heuristic firing indicating a malicious redirector. The document body text, though heavily obfuscated, contains language related to 'auditing and assurance services' and includes the malicious URL. This suggests the document is designed to trick users into clicking the link, likely leading to a phishing or malware download 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=auditing+and+assurance+services+17th+edition+pdf
    • http://bemuni.gracefulbirthandfamilies.com/uploads/1/3/0/7/130738799/sevivusufedis.pdf
    • http://files.frosttechlab.com/uploads/1/3/1/3/131381881/josakefuporef-memud-gutos-jeleku.pdf
    • http://files.vyod.us/uploads/1/3/1/3/131398025/menuvilakevovev.pdf
    • http://files.womensalliancela.com/uploads/1/3/1/4/131437474/9050081.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/72884114304.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/mefekovil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/rewrite_the_stars_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/lirawituwiwamusanupav.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/30266385602.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/jedavosi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/37782408149.pdf
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/aircraft_engineering_principles_lloyd_dingle.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/zezatag.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/bavarugili.pdf
    • https://cdn.shopify.com/s/files/1/0436/7033/9737/files/mozifeleviwaxeguvovulonus.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0784/files/cbse_class_12_computer_science_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/0981/files/digitech_rp1000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/ariens_lawn_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6545/8336/files/22602303886.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_off000074da.bin
c8c89f069d1a0e41459a9ae6ab2cd57a45a83e76d1199f2c53df754acb96a84e
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DA 5568 bytes
font_01_sfnt_off000087de.bin
dc90c2f8369fb2c212333f690e202354b3bc644dd4dbb5a0b57722677d938a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x87DE 12852 bytes