Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79cdffe88deec8e…

MALICIOUS

PDF

48.6 KB Created: 2020-08-14 04:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc924e90ae0d3ed2d66a7113e93d4ddd SHA-1: 61708f71bc02915d9cd579fdd0d8bbf69585bcbc SHA-256: b79cdffe88deec8ec6460783a4611fae97af25e659e50a63b39049f552dae530
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=canciones+infantiles+cortos+pdf'. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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=canciones+infantiles+cortos+pdf
    • http://files.forgivenphotographymn.com/uploads/1/3/1/3/131398515/8082352.pdf
    • http://files.academy-of-excellence.com/uploads/1/3/0/7/130775744/nilejisupofoz.pdf
    • http://files.jazzpaws.co/uploads/1/3/2/7/132712268/kusofamezemupa_bedido_junezegijil_jedobawibiroziz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/ccna_certification_exam.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/league_of_legends_ashe_build.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/pinefekejuliban.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/bank_book_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/56598456283.pdf
    • https://cdn.shopify.com/s/files/1/0434/0649/1797/files/6382303133.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/bobame.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/rumigotopuzorijinedimuvit.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/xakudavivafozokinef.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5976/files/17981372653.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007632.bin
7971ca1e6bfc6d0aa5026fc34aa3825a5286a6592a25961028af1283aa0f0825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7632 5052 bytes
font_01_sfnt_off00008764.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8764 1800 bytes
font_02_sfnt_off00008ff1.bin
5dba82870c108c2716e525a2aed235eea883242d9d979dd5ba4038eff25778de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF1 11664 bytes

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