Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4b150fa6b0fa83…

MALICIOUS

PDF

53.8 KB Created: 2020-09-06 17:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06019b7d9b884388e6212ed784d30dd8 SHA-1: 79285923cfad47afd9cfdf1a327ecf67896060d3 SHA-256: 8f4b150fa6b0fa833da11f27010aeeaf8d8aeb35ebf3ea67f072039374261bc3
150 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.me, which is likely used to distribute malware or lead users to phishing pages. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector and link farm suggests a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=template+design+for+newsletter
    • https://static.usrfiles.com/ugd/704566_a397645603694e9a8393f71e8e60c8c3.pdf
    • https://static.usrfiles.com/ugd/2eedf1_74244876c4ce4b95beee357e69095133.pdf
    • https://static.usrfiles.com/ugd/fdee49_7c6eb035607b4befb960214ca0876b9c.pdf
    • https://static.usrfiles.com/ugd/963627_68f81c11e5794ab59eb88b3a92d746bf.pdf
    • https://static.usrfiles.com/ugd/6f53d7_ce76d20864834155a63c260d95e14ccc.pdf
    • https://static.usrfiles.com/ugd/4d935e_19f23f3059774170945d1aed65f9a0df.pdf
    • https://static.usrfiles.com/ugd/74a852_6d6861cc47774eecb29615dfc2aa6c57.pdf
    • https://static.usrfiles.com/ugd/ab059d_125d206fc87d4565b59bddcabbec737f.pdf
    • https://static.usrfiles.com/ugd/575fb0_a2e8f2bd02a541cbb23960387d51068a.pdf
    • https://cdn.shopify.com/s/files/1/0438/6573/5328/files/angry_birds_sms_sound.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/bakabapavapowir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/31654257581.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/cytonn_hospitality_report_2018.pdf
    • https://static.usrfiles.com/ugd/b7082a_a34466e57c8143d1906ad35a42b227b6.pdf
    • https://static.usrfiles.com/ugd/3225da_d5a04f93ad944136a73ee59d837033e1.pdf
    • https://static.usrfiles.com/ugd/7ab50f_e4d4a24b8ba348fc812036bfd24035c4.pdf
    • https://static.usrfiles.com/ugd/b7ed05_557bce2238824d82be0c93ec8b316423.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b85.bin
4b0fd5f37d424693e36ec97ffc8d46069c1f47e06ceda209625a7b305726623c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B85 5404 bytes
font_01_sfnt_off00008dd5.bin
87560c96094722e0b06e960fc6e6e0982e5dd9a45b3b8c8ce6a725bc3f373f32
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD5 2268 bytes
font_02_sfnt_off000097e7.bin
e1e7ea17a4e8c3ec94daa4d6c065b03fe7f7ad11769621278bb0c53570f6be54
pdf-font-stream PDF embedded font (sfnt) at offset 0x97E7 15964 bytes