Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5863fc0280b24f…

MALICIOUS

PDF

42.9 KB Created: 2020-08-29 21:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4a9017c4c129154abc102c51248706d SHA-1: 6f55b60dfcb2c7d6ca1dcec96a8df3a80c225ac3 SHA-256: cd5863fc0280b24fe78a0c367159dfb189665832e43dd1edba0c5deac6d4bc8a
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, and the PDF structure itself is not inherently malicious beyond the embedded links.

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=gate+aptitude+questions+and+answers+for+mechanical+engineers+pdf
    • https://static.usrfiles.com/ugd/b8c837_c73477439cc14087a76c724466a4ec3f.pdf
    • https://static.usrfiles.com/ugd/585b1d_e8eb09a583244a03915f1fb2a5792b76.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2d27630e4ba46c597b0f2092827d8fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_76f1e2bbcfa240e8ba01273a0e1bb731.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/chiaro_corso_di_italiano_a2.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5812/files/binance_app_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9605/files/49900444660.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea840c07449841309ba662df1533cf19.pdf
    • https://static.usrfiles.com/ugd/409ca8_4a1bf2a7274d4152811d6baea298cb93.pdf
    • https://static.usrfiles.com/ugd/16a96a_85e1df4c116846a0b11dd41fe942a844.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4120/files/small_android_cell_phones_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0439/7803/1262/files/sample_leave_application_letter.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_off000065e4.bin
c9689c998ddfccb4d2e2139431df1cd94076792853017bdfcf398fc42684afc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 5816 bytes
font_01_sfnt_off0000799f.bin
7ab9a38f044a64eba54ae84630ebdf00f0280b4eefffa4672a12609a1c3b2306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799F 10772 bytes

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