Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2995da7f3c26d25…

MALICIOUS

PDF

47.0 KB Created: 2020-08-06 05:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7737051d2c67f6c923ff456b15f4a005 SHA-1: f26f98a2b0030c9eb282366c956c5ca28fd5c334 SHA-256: b2995da7f3c26d25b3d3a1e7acfa0826441e4ba908096ffa688343921f2e5eb3
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. This link is presented with a lure of 'calculus 1 pdf free download', suggesting a phishing or scam attempt. The presence of a 'download button' heuristic further supports this. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack vector.

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=calculus+1+pdf+free+download
    • http://files.escalantelife.com/uploads/1/3/2/6/132682833/wikemetulusisu.pdf
    • http://files.unstoppableachievers.com/uploads/1/3/1/3/131381078/tanobifarilive-rawatizewalof-taneferasig.pdf
    • http://files.lexasluxuriouslooks.com/uploads/1/3/2/6/132695354/golosisefawev.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/vitotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/folivelaminaruvewo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1918/7862/files/how_to_print_something_out_in_tkinter.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/xatejobujir.pdf
    • https://cdn.shopify.com/s/files/1/0438/8087/4139/files/60995411021.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/wixagavixerut.pdf
    • https://cdn.shopify.com/s/files/1/0435/4483/8303/files/67934623950.pdf
    • https://cdn.shopify.com/s/files/1/0433/4803/3689/files/726029815.pdf
    • https://cdn.shopify.com/s/files/1/0440/6276/9302/files/advanced_characterization_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/58042344448.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/xakafibew.pdf
    • https://cdn.shopify.com/s/files/1/0436/6978/2693/files/jukifemorebivojejupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4863/files/82116600157.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/
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000711f.bin
16f64c654808e610aac9ccddf7c0076fbe465a4f3478999b252ea358020ffbd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 5196 bytes
font_01_sfnt_off000082e7.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x82E7 1800 bytes
font_02_sfnt_off00008b75.bin
137bc2adca108ffba4def799c78a56adedaa06a4c159c133faa807e2ac99a62a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B75 10192 bytes