Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ba50616bb2ddd3…

MALICIOUS

PDF

45.8 KB Created: 2020-08-30 12:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6bf44435c6ad71501cf3346c9167fb3 SHA-1: 3d4d3558e2766b1f4c156e6e70b8ed283e3bb6c5 SHA-256: d3ba50616bb2ddd3f8f4817ba6aaf1e226c91484c632d605086f17fd6f1a38fe
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of these links, 'https://ttraff.ru/wix?keyword=brand+positioning+bull%2527+s+eye+template', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and a repeated URL, suggesting it is not intended for human consumption but rather to host links.

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.ru/wix?keyword=brand+positioning+bull%2527+s+eye+template
    • https://static.usrfiles.com/ugd/b8c837_7b8697ee309d48c9b1c8779998d8d11d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dd1f4941204249bc8796e2d77bc6a5.pdf
    • https://static.usrfiles.com/ugd/76156b_3206c328774a4a1b81e2f9fbd9b3bdce.pdf
    • https://static.usrfiles.com/ugd/b8c837_4888ca9a04c847228ff20eebe8ea2965.pdf
    • https://static.usrfiles.com/ugd/b8c837_83c94c35d1d04a19bc32a8329cb88f04.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f2b8e7dab6147c78548b4e5b26f0096.pdf
    • https://static.usrfiles.com/ugd/23e9be_3eae9b78e9224cd599305ca20d9e369d.pdf
    • https://static.usrfiles.com/ugd/2274a7_0d9d2be57f9a4a51b07263053590aac3.pdf
    • https://static.usrfiles.com/ugd/b8c837_67e6f8e56fe944c8902bad339d3ce75f.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/sokomadigiwinerepododuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/dofilefifozilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/86687667343.pdf
    • https://static.usrfiles.com/ugd/b8c837_09eb44ff6261448a9168e17322fdcf36.pdf
    • https://static.usrfiles.com/ugd/df4650_862a5e94728948ada3be13cb29ea1169.pdf
    • https://static.usrfiles.com/ugd/b8c837_7eaab494c2c649598140e8a8cbc426e2.pdf
    • https://static.usrfiles.com/ugd/87b9a8_06021bf850e041f891e5f6650fd97b30.pdf
    • https://static.usrfiles.com/ugd/735189_c81e3861c7984a188a6831c48df8e2b6.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://static.usrfiles.com/ugd/735189_c8

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006519.bin
cfc74163074f4e7d700b327707101e76af245f2cf9021804755aa2204e2fc453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6519 5488 bytes
font_01_sfnt_off000077a6.bin
597f54c29192dec8bdda7900b6be6003c127e2edbbf33e8522d47546bd36d331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A6 10612 bytes
font_02_sfnt_off00009baa.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAA 4324 bytes

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