Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2b520dfb3332e4…

MALICIOUS

PDF

60.9 KB Created: 2020-08-30 14:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 994631b79fbd6b6c32aeb0d9b87cb48b SHA-1: d19cb4c545a2eaa073e756ccba66222078123185 SHA-256: 0c2b520dfb3332e40f50c47627112f456104869225f6d59d7045763a755c7f71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a product review. This suggests an attempt to lure users to malicious infrastructure. The PDF also contains a large number of links to other PDFs, indicating a potential link farm or SEO manipulation tactic. 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.com/wix?keyword=samsung+un65nu740dfxza+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2c608b_3536c5ccb4854107a22fc2fa0a5565bd.pdf
    • https://static.usrfiles.com/ugd/455f95_bf0d58d263cd453dbf85898779443eba.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5721da99c474acd9b377d6813ebcd16.pdf
    • https://static.usrfiles.com/ugd/b8c837_38f41229ab5145edbf50adf1b5c48933.pdf
    • https://static.usrfiles.com/ugd/c5d40f_a198fde9ba264075b5ba2626145ccaf8.pdf
    • https://static.usrfiles.com/ugd/97aff7_11427c534b0d4971a285f8285e33b316.pdf
    • https://static.usrfiles.com/ugd/b8c837_07edbf501a6e4043b1c014301e877171.pdf
    • https://static.usrfiles.com/ugd/b8c837_f453484c0fce4c15bf2363b5383b5521.pdf
    • https://static.usrfiles.com/ugd/b8c837_83e4c4ebe5e248818274c52a61ffd01a.pdf
    • https://static.usrfiles.com/ugd/f46427_58a2c8d1f5c24a4f902455a288d346d9.pdf
    • https://static.usrfiles.com/ugd/c5d40f_2816b7839b484bb3ba997927db7e4dd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb3e9cba73aa445f81421af8485bc7b5.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/8498229961.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/webomobituwisumepepaxifi.pdf
    • https://cdn.shopify.com/s/files/1/0465/3252/6238/files/khiladi_bengali_movie_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/ahle_hadith_books_bangla.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_off0000ae54.bin
d7e787b5a5944605e538016258aa27a095f19aa1391e9bef36ed1de3ac3ab23b
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE54 6156 bytes
font_01_sfnt_off0000c351.bin
b174a95c7b0e9497f5dc32f493aacd7d1fa820b0177356f7fb1d80b750f1a8ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xC351 10376 bytes