Malicious PDF — malware analysis report

Static analysis result for SHA-256 335e6b278ac01175…

MALICIOUS

PDF

70.9 KB Created: 2020-08-07 08:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe480196db887ed1f376a86d2ebc5270 SHA-1: 5aba73fa4d684ad0d81963e6a1d860b321650f7d SHA-256: 335e6b278ac01175dbcfd54233cc2b27f5e1beb20f2497f7ea1e13e7de4968d7
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to calculus textbooks and the wkhtmltopdf tool, suggesting a lure to disguise malicious content. The presence of numerous links, including the malicious redirector, indicates an attempt to drive traffic to potentially harmful sites.

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.com/pify?keyword=calculus+early+transcendentals+10th+edition+answers+pdf
    • http://tesotun.allveteransmemorialpark.org/uploads/1/3/1/4/131407406/a28f79dcc0a2994.pdf
    • http://files.cdcatparker.com/uploads/1/3/0/7/130776368/wejoz.pdf
    • http://files.nordbywoodcraft.com/uploads/1/3/1/8/131871992/97c51d49cc16.pdf
    • http://files.jennygass.com/uploads/1/3/0/8/130813079/aee7e7.pdf
    • https://cdn.shopify.com/s/files/1/0434/4971/2806/files/30389135326.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/vigijovuzadidiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/95091650793.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/nusosiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/48872050711.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/60030893220.pdf
    • https://cdn.shopify.com/s/files/1/0434/5898/6150/files/fuzebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/280680.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1025/files/present_perfect_past_simple_exercises_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/catharsis_in_oedipus_rex.pdf
    • https://cdn.shopify.com/s/files/1/0428/2200/8988/files/pa_cdl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/45377139184.pdf
    • https://cdn.shopify.com/s/files/1/0436/2806/9017/files/alternating_current_machines_by_puchstein_and_lloyd_free_download.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a091.bin
2c5af19c2a0055687ea64551a76003d7f3853a97734432bccdc5d771eaecd7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA091 5536 bytes
font_01_sfnt_off0000b370.bin
c5b453d0cacedb53505e813196b1fab130c37ae889da1b6a9575f18baaa9ff86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 2184 bytes
font_02_sfnt_off0000bcd3.bin
4af6003195abcf2551314541174532a8586d5843bdfb58c556ac17e7b94fb29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 14076 bytes
font_03_sfnt_off0000ea21.bin
6bd38090ed777df9b92677ea85131394f31f8e693e2fa156965331ed3544f37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16140 bytes
font_04_sfnt_off0000ff2b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 4324 bytes

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