Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b732d88fd2a6474…

MALICIOUS

PDF

69.1 KB Created: 2020-08-11 21:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac43236934e1dba3f837f71b3099bce7 SHA-1: 75cccfa0ce9e0aa60e8106417d7535971797311d SHA-256: 6b732d88fd2a647418ec027a28b6a199b21fa3804a6fab9e1c59dc331fd033a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.ru/pify?keyword=stokes+theorem+proof+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to malicious infrastructure.

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.ru/pify?keyword=stokes+theorem+proof+pdf
    • http://files.soccerskillschools.com/uploads/1/3/1/6/131636676/428e069.pdf
    • http://detobol.edgertonbookfestival.org/uploads/1/3/2/8/132814930/48077.pdf
    • http://files.cleanandleanmixes.com/uploads/1/3/1/3/131378838/mufupalipalumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/wakemezavaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/miguzajorosusirupuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/2805/2130/files/sansumg_ml_2165w.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwofomakilaxenifotet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/nezufadisubeja.pdf
    • https://cdn.shopify.com/s/files/1/0437/4459/2021/files/honeysuckle_rose_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/differential_diagnosis_appendicitis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0285/files/zavidamodobemeka.pdf
    • https://cdn.shopify.com/s/files/1/0438/2146/5757/files/pofil.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/37203310898.pdf
    • https://cdn.shopify.com/s/files/1/0433/9082/8700/files/verajuv.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c9e.bin
0a4c84c2aaec14e0b7258e88eb27b649332ea2ea0814b462b9367df9f0ff261f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9E 4840 bytes
font_01_sfnt_off0000ad0b.bin
56933f7aaed937c2d58d07901d93ffb4e1db3bb151db7807245892edde58cba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0B 16732 bytes
font_02_sfnt_off0000e142.bin
5c53297c1db4548fd3c771da0fc6908dd1aee30ad8622a83b68de528f765aadf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16864 bytes
font_03_sfnt_off0000f95e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 4324 bytes

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