Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad471911c62daf2…

MALICIOUS

PDF

43.5 KB Created: 2020-08-04 07:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a87c1a9e7147eb9fafff204866d80f9 SHA-1: 26a3bd2a3e32f40c148ab014880b9e7c5c515cf5 SHA-256: 3ad471911c62daf2b8e670ed8f9dcb98cebc9f9a6de19e0adf517eb8dd7892a7
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting educational content. The document body, though heavily obfuscated, contains references to the same malicious URL and other URLs hosted on Shopify, likely as part of a link farm to improve search engine ranking for malicious content.

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.ru/pify?keyword=lista+exercicios+tabela+periodica+pdf
    • http://files.johnvcatania.com/uploads/1/3/1/3/131382092/nokesemesi.pdf
    • http://files.thegoldenguesthouse.com/uploads/1/3/1/1/131164310/bejekazizugu.pdf
    • http://files.wildsidedestinations.com/uploads/1/3/1/0/131069763/8480767.pdf
    • http://files.whhstdc.com/uploads/1/3/1/0/131070771/togure_vuvazusobik_selimaxakuxib_delitik.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/52060865565.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4085/files/luxunezufemebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/ponujomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90442425312.pdf
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/bsc_physics_honours_practical_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/jebudutigovem.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/domagasiridonagep.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/tusob.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/79136842772.pdf
    • https://cdn.shopify.com/s/files/1/0439/3009/1688/files/pebilevijimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/negap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006949.bin
a9e25fc3e59bac85b48d99cf317de145663285d2f50219d9160e796786207c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6949 5300 bytes
font_01_sfnt_off00007b5f.bin
c3ba0f49384cfd9a1fcaca36e856457d1d4c62a352eaf7cd0b5985d0962dafd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5F 11148 bytes

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