Malicious PDF — malware analysis report

Static analysis result for SHA-256 7633104f68fcd4e5…

MALICIOUS

PDF

39.3 KB Created: 2020-09-08 13:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5fb66d70a5c94d47b7296895daffa89 SHA-1: 00145efbe17ab6e29541f68800700bc79ccc5a39 SHA-256: 7633104f68fcd4e53a9330af1f25c4262db97ea7b429460edb66d31557c78b40
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body contains the same malicious URL and numerous benign-looking PDF links, likely to obscure the malicious intent.

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.club/wix?keyword=simple+present+tense+affirmative+form+examples
    • https://cdn.shopify.com/s/files/1/0432/3462/3643/files/chinese_english_visual_bilingual_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/1243/7662/files/kevoleparodulixiluxav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/tulumamufetaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/77963389389.pdf
    • https://cdn.shopify.com/s/files/1/0440/0657/2182/files/lelezixogaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/operating_system_concepts_10th_editi.pdf
    • https://cdn.shopify.com/s/files/1/0447/4735/8362/files/the_chronicles_of_narnia_the_silver_chair_book.pdf
    • https://static.usrfiles.com/ugd/8e1900_574344de37a44db4aa445bad7bea779e.pdf
    • https://static.usrfiles.com/ugd/1e32c2_f2826b6b886940bdb2238bd400799bbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_c79df8530f58410ab29620deeff8cf9f.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/pajumegazirowaroze.pdf
    • https://cdn.shopify.com/s/files/1/0436/4923/7145/files/wupawimamibolitinixudero.pdf
    • https://cdn.shopify.com/s/files/1/0433/4944/2713/files/cm_browser_untuk_pc.pdf
    • https://cdn.shopify.com/s/files/1/0471/0649/0518/files/athletic_style_fonts_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/7905/5000/files/kawhi_leonard_quote_bleacher_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c51.bin
6bffec96a1babe48cb0b88b46d989ce1608a318ab4b0b89b4286facd730c8c38
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C51 5276 bytes
font_01_sfnt_off00006e30.bin
7b38e720e9add9be94a4744e42972d44145031906fb5e631bfa6259d9f6c8b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E30 9972 bytes