Malicious PDF — malware analysis report

Static analysis result for SHA-256 802ef309f894fe5d…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 10:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cd8a9958a0f9ae10e9c1e6f52405fd3 SHA-1: bb763910423074426f96293c830e3c8ac1275afd SHA-256: 802ef309f894fe5d370ed3640476f4a7e77615bef37135b74e79676ae538a912
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=estrategias+didacticas+para+preescolar+pdf'. The document body, though heavily obfuscated, contains text suggesting it is related to educational materials, likely a lure. The presence of multiple external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=estrategias+didacticas+para+preescolar+pdf
    • http://nudadobu.cannonvalleycivilwarroundtable.org/uploads/1/3/1/4/131438216/3011171.pdf
    • http://sukafe.lamassou.com/uploads/1/3/2/8/132814930/88934a45a62f27.pdf
    • http://files.jerseyyachting.co.uk/uploads/1/3/0/7/130739069/5692488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/66879918422.pdf
    • https://cdn.shopify.com/s/files/1/0439/5958/2878/files/livejunibajaminabumiwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/fixetaroza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86556218032.pdf
    • https://cdn.shopify.com/s/files/1/0436/5172/7513/files/ziketeravivisevurikem.pdf
    • https://cdn.shopify.com/s/files/1/0434/8038/3653/files/ejercicios_abdominales_hombre.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/winoxilerudizixadejugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/english_grammar_book_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/tikijisekakibuxawuvol.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_off00006bed.bin
b3bcd901e0a6f6f6e701607eaba4831712408d12b599f30ac8fb6e5fb5550ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BED 5280 bytes
font_01_sfnt_off00007dea.bin
0f5d9274d1e0561bfb96d91169f2b81bd49bc53202bb9fddeca89bf85bb57cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEA 9824 bytes

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