Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb210a0b1b5a5fa…

MALICIOUS

PDF

54.1 KB Created: 2020-09-04 10:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c155f7a8da643e7221624a564f788a SHA-1: 3f6788b61447c54ecbb251ccffd43a8a70800413 SHA-256: cbb210a0b1b5a5fa3e6dd5f886d40fea684e300ead5611d09bda807a42973e23
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=fox+tv+guide+movies'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent.

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.cc/wix?keyword=fox+tv+guide+movies
    • https://static.usrfiles.com/ugd/5e8de6_1ab56eac143d4b9ea2b381647b3df746.pdf
    • https://static.usrfiles.com/ugd/3dd68e_87f7f7a5bef744248dc251273b943449.pdf
    • https://static.usrfiles.com/ugd/7be1cd_65d2bc2e87b44be5a6e1fab06379ec1f.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/xiniravaselapewemubifujo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3183/6310/files/o_with_slash_alt_code.pdf
    • https://cdn.shopify.com/s/files/1/0462/1733/0842/files/civil_service_interview_question_and_answer.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/xusisogajowebil.pdf
    • https://static.usrfiles.com/ugd/694d5d_52dafb02b150400ea41b8351e8cb6b56.pdf
    • https://static.usrfiles.com/ugd/c81504_6d6cdcb61c4c4b61b25e54c7e738dda7.pdf
    • https://static.usrfiles.com/ugd/3f0e57_7168394d4faf403a93d0179fb1012d89.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/dodele.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/slave_maker_3.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://cdn.shopify.com/s/files/1/0432/8679/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089f5.bin
df12b04905267c5c75929e1095dc066665fcda6cf28b6d9004ba38238a8b4145
pdf-font-stream PDF embedded font (sfnt) at offset 0x89F5 4668 bytes
font_01_sfnt_off000099f7.bin
cd85f34789dce7f77b3ea6afc09917ae6c4a1bfbf4ae7c99243cce763c525158
pdf-font-stream PDF embedded font (sfnt) at offset 0x99F7 10496 bytes
font_02_sfnt_off0000bdac.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAC 4324 bytes