Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c94192abfad7a0…

MALICIOUS

PDF

50.2 KB Created: 2020-08-30 11:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9de5fea5c07ebad82bf9bf83bb24b724 SHA-1: 5dd2a2374b363e9d4dc09a9220672e399004c606 SHA-256: 52c94192abfad7a0f47aa7c7ae69ac1bd84d9babb2a151faa899715ffa06f733
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a link farm and a redirector to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.com/wix?keyword=prega%25C3%25A7%25C3%25A3o+expositiva+livro+saraiva, which is identified as a malicious redirector. The presence of numerous external links suggests a campaign aimed at driving traffic to malicious sites, likely for phishing or malware distribution.

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.com/wix?keyword=prega%25C3%25A7%25C3%25A3o+expositiva+livro+saraiva
    • https://static.usrfiles.com/ugd/8e1900_c5cba3ae5d9f483cbab7ebed8f6ebd79.pdf
    • https://static.usrfiles.com/ugd/4dd980_1fc9102c67044c2ebb80c203dd022bc0.pdf
    • https://static.usrfiles.com/ugd/49be48_b2048341a5fe451c891b4a76fbf5dfc8.pdf
    • https://static.usrfiles.com/ugd/8b2c09_635d6c615d424747a73a8b61ef4d750d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ed402bc9134b75bfcbc7866d5e1031.pdf
    • https://static.usrfiles.com/ugd/b8c837_204bb326273f4272aa134ac9d59bad5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3433511748414b0bb0f16530a5d1db0c.pdf
    • https://static.usrfiles.com/ugd/5de1df_e384925b3eb94005a21658ef6b064953.pdf
    • https://static.usrfiles.com/ugd/b8c837_e41261e3f39d47ac8a0695c7094588b7.pdf
    • https://static.usrfiles.com/ugd/1a89c8_8cb060a259a9414584c4875a9ce1f376.pdf
    • https://static.usrfiles.com/ugd/67e251_680e3b003f6a4c74b217df64e4ea587f.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/discord_quote_block.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/15499304743.pdf
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/24970071970.pdf
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/boolean_logic_cheat_sheet.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/49be48_b2048341a5fe451c8

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000652a.bin
aa2fd94fcd1ca6d66cf89d55a183885a5b83a74b960c5ac78ed2bec0e2233f4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x652A 5616 bytes
font_01_sfnt_off000077c5.bin
7eac11e8cb6e0013ccdd6388713beda5c05aa234b7b3c7fc043f94bbedd12df8
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C5 12820 bytes
font_02_sfnt_off00009ea8.bin
e8ab15b4716121a7b3f5f2f66960d5e8599b2c8a236fd1bb15e165779f14db73
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA8 17688 bytes