Malicious PDF — malware analysis report

Static analysis result for SHA-256 385dc94422b7a856…

MALICIOUS

PDF

38.5 KB Created: 2020-08-29 10:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce533848df6577370742c8d2fbdd244f SHA-1: 378a934fe2731e9d68695149344ef21cc3ccf582 SHA-256: 385dc94422b7a85645f515d2091e56be7f4cc009b78626b8cec82198c742d7ac
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com' and 'cdn.shopify.com'. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a 'dining zoo game'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=dining+zoo+game
    • https://static.usrfiles.com/ugd/b8c837_cda46ba4730747419bd7f9e1bb3a2070.pdf
    • https://static.usrfiles.com/ugd/b8c837_1854796f68aa48ba8ef2d54570f67e0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a5d3c55f344a95a4998d1bb1290c7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b633df11384b4171b8969926aacb097b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a07ca46983945c9a32d91639ec6db3f.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/lunoneveviwos.pdf
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/bash_echo_newline.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/butemifif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/tibaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/25337492433.pdf
    • https://cdn.shopify.com/s/files/1/0435/8147/2929/files/dudezomagonowa.pdf
    • https://cdn.shopify.com/s/files/1/0464/6846/4792/files/3269253033.pdf
    • https://cdn.shopify.com/s/files/1/0429/3607/4396/files/78212729502.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/zasotekoxugenozejijowo.pdf
    • https://static.usrfiles.com/ugd/b8c837_82385f9d59ed4428bca736db4adbc6de.pdf
    • https://static.usrfiles.com/ugd/b8c837_823b7297ebca41deaec185fb62dd30a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_62e7d0fc78bf44aeb11db80e0ba0244c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dcbb7440464f94805d8184ef6f772f.pdf
    • https://static.usrfiles.com/ugd/b8c837_60a2b0324e5e4562ad4f5ea1b57b51ee.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_off00004f64.bin
7b152204370bb4db604ff7bfa548ab43fd1e3c8dc3128e5470da14e0fbc4d695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F64 4456 bytes
font_01_sfnt_off00005e6c.bin
28069729fd3197290d35b4aa4762e373d4af93299869f3479d877be85b25cd29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6C 9492 bytes
font_02_sfnt_off00007edc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDC 4324 bytes

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