Malicious PDF — malware analysis report

Static analysis result for SHA-256 f792ee0e85bd50f1…

MALICIOUS

PDF

52.0 KB Created: 2020-08-17 11:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9f60716d2f901dc3e2c06ce2739a7c SHA-1: 9bb1c3b54da7f548e5467619bb120e9aa6b909da SHA-256: f792ee0e85bd50f1445492cfee421b27442f2afcb29875a629175ce616bc8236
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=check+point+software+firewall', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users into clicking malicious links. The ML classifier also strongly indicated maliciousness.

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=check+point+software+firewall
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • http://files.stevetowers.com/uploads/1/3/0/7/130738997/805084.pdf
    • http://kutug.ohioarea14.org/uploads/1/3/2/6/132683071/xufuparevugupi-gozalesafotusab.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/age_of_empires_4_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/13673777953.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3414/files/fasaburuzisejod.pdf
    • https://cdn.shopify.com/s/files/1/0439/8609/2190/files/english_article_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/basic_english_to_spanish_words.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/audyt_bezpieczestwa_informacji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mejiwevabefi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1038/files/polaroid_premium_white_mailing_labels_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/batudibirexavunaniziza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/17697451996.pdf
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/66380876910.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/17254260047.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006122.bin
9563ec37d36a64fcbddf5fa01604e5a4e6803bf98cec8c8c9ee49e09311b68b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 9252 bytes
font_01_sfnt_off00007f98.bin
f192d1207ea081667bc472b1979bc35bdede819d958223932fa0a56916c4537e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F98 5072 bytes
font_02_sfnt_off000090da.bin
3c9eb0781966a5c038383c19de559a518226286297e0080581c60cbfc8f035df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DA 10544 bytes
font_03_sfnt_off0000b4bb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 4324 bytes

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