Malicious PDF — malware analysis report

Static analysis result for SHA-256 759f35fcd0bf64a9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 21:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff3481db522f7c984fcabec1688bfd6a SHA-1: 7c1d39689cb202969088af9b68e2d61c72482d09 SHA-256: 759f35fcd0bf64a94dc1cf6c74ec1a1d3a50491641f1447f71244553963a40db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical redirector link, indicating a malicious intent to redirect users to harmful content. The embedded document body text, though heavily obfuscated, contains the same malicious URL found in the heuristics, suggesting a lure for users to click on the link for song downloads. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=burra+katha+naa+songs+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/51933867632.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0935/files/77476170329.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/supply_contract_template_australia.pdf
    • https://cdn.shopify.com/s/files/1/0431/6499/1649/files/analytical_skills_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/47106564910.pdf
    • https://static.usrfiles.com/ugd/b8c837_32bc560b756d44e78d1964fecf29cc72.pdf
    • https://static.usrfiles.com/ugd/1f2646_0a81fbd43f66490ea1552681c35225cc.pdf
    • https://static.usrfiles.com/ugd/de02f3_12095a66f7024721ace87fffbc200af5.pdf
    • https://static.usrfiles.com/ugd/15d534_2f02c532c13944aab8eff77dc0a18264.pdf
    • https://static.usrfiles.com/ugd/455f95_bcf112894da740b3be552920d7bcd4e5.pdf
    • https://static.usrfiles.com/ugd/429b25_365baec4cf114a00922f3ee98e1759b3.pdf
    • https://static.usrfiles.com/ugd/921909_cf40891d9676455a93284492b458cc62.pdf
    • https://static.usrfiles.com/ugd/12745a_a06e2da8b1f94c7f82859ee1b26eeabc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c05a8106e4f4d20abb1ec9ebb321216.pdf
    • https://static.usrfiles.com/ugd/cb5dea_642c96725b1a480ba6054234ec2d1e6a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006afb.bin
e141057b82ca611344c264f1b2479d7e1cdf66276d598c417555c0a9de2b601f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 5108 bytes
font_01_sfnt_off00007c60.bin
c66c04615ab4831f76a414daa5ac769c7ef748f778913473c17195f170f68158
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C60 14964 bytes