Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b2dcea43607e2…

MALICIOUS

PDF

41.1 KB Created: 2020-08-22 11:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea7c99843c057ca1d69a7e41f242d6b9 SHA-1: c20c6ee916620a6a1c2f387bcda961cf48e20f48 SHA-256: 798b2dcea43607e21591401721e556ba6d3d35f9b8a7bffcb444e130f6522473
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://ttraff.ru/pify?keyword=bhojpuri+dj+video+song++hd, is identified as a known malicious redirector. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a malicious intent, likely to lead users to harmful content or exploit them through further redirects.

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=bhojpuri+dj+video+song++hd
    • http://tobofug.iemministries.net/uploads/1/3/0/7/130775291/b2f74d0df438e3.pdf
    • http://files.shavanocreek.com/uploads/1/3/1/6/131606395/1042335.pdf
    • http://xafajol.isabelsherk.com/uploads/1/3/1/3/131379730/7126304.pdf
    • http://fubivare.skateteamindy.com/uploads/1/3/2/3/132303093/f6d1d9cb9afd4be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/bombastic_brothers_mod_apk_free_shopping.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/furatuxizomepow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4736/2453/files/wwe_raw_finn_balor_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.pdf
    • https://cdn.shopify.com/s/files/1/0432/2374/4674/files/84511270807.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0575/files/36363164844.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/terjemahan_surah_al_waqiah.pdf
    • https://cdn.shopify.com/s/files/1/0446/9227/5353/files/dilovariwinukipa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/39373089994.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2054/files/hash_table_implementation_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/dimemokekinanavefuvoxiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000564c.bin
63a52904d83929ec3ccc9580c2eeafcb7cd1e2467d22c8107c3e3c5e6ad238fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x564C 4968 bytes
font_01_sfnt_off0000672b.bin
6e62aa48b8f8e4d08f5f1219de44b14cff861e5c6455c25a6e8b1a3588e99e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 10084 bytes
font_02_sfnt_off000089ac.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89AC 4324 bytes

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