Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab78e52ef5ca8eb…

MALICIOUS

PDF

52.1 KB Created: 2020-08-09 15:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97e2de3d71a0ebcdfd9a1dc885222981 SHA-1: a12ba345f3ae54edb6d6ac909736110190e61c92 SHA-256: bab78e52ef5ca8eb02aa7fe3969adda3deeb06d9eb4d5e8b00c54146dcdf252c
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is ttraff.ru, which is likely used to redirect users to further malicious content. The document body contains garbled text but also includes the malicious URL, suggesting an attempt to disguise its true nature.

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.ru/pify?keyword=benitos+menu+pdf
    • http://files.awesomevoices.net/uploads/1/3/1/3/131384432/256ac832b.pdf
    • http://files.dmserra.com/uploads/1/3/1/4/131437689/1299118bffb6.pdf
    • http://files.outstandinglibrarian.org/uploads/1/3/1/6/131636914/gazugus_zugokezinu_bapegusonulog.pdf
    • http://files.kristofferto.com/uploads/1/3/2/7/132710624/5af45f21d37.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/24046677574.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/rock_forming_minerals_in_thin_section.pdf
    • https://cdn.shopify.com/s/files/1/0434/4997/4946/files/c_string_to_lowercase.pdf
    • https://cdn.shopify.com/s/files/1/0439/9559/4910/files/cecelia_ahern_the_gift_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/41020526143.pdf
    • https://cdn.shopify.com/s/files/1/0441/1083/9960/files/definition_of_birth_asphyxia.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6284/files/jubomifedorupilikomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/zufawilanujixiwazuzeko.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/lemuzaxataveru.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/24670637051.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/19202469661.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/sigebis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006184.bin
641c07c46b786ef4be9a28d8ec2a487d6266846e083184f4fd68ca4023354656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6184 4780 bytes
font_01_sfnt_off000071b4.bin
ea03abf602cf80682997aa1f95307c7a9c6e11728fed33b6887ecd6ef278c4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B4 14316 bytes
font_02_sfnt_off00009ecf.bin
e8cb11c66b9da036f5046388ecc2467d4131a8070a5cdd0d583845b767b493fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECF 16420 bytes
font_03_sfnt_off0000b51f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 4324 bytes

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