Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fadeba222a56c4…

MALICIOUS

PDF

40.1 KB Created: 2020-08-27 18:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c790b81426f578057c7b1668bb6fa16 SHA-1: c6230242b9c891ac7e4c7375bd8464bb56034ebf SHA-256: 18fadeba222a56c444e02b763c6c29f19b9d1d3980112a40983bcc58709c7177
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, https://ttraff.ru/pify?keyword=cbt+alfonso+leon+de+garay, points to known malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to contain many of the extracted URLs, suggesting a link farm or SEO spamming attempt.

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=cbt+alfonso+leon+de+garay
    • http://files.rootsofeducation.com/uploads/1/3/1/3/131380440/gides-lexaxegefojom-bigofijat-fipexetux.pdf
    • http://kiwak.orchardheightsonthefox.com/uploads/1/3/0/8/130814674/f8d884b.pdf
    • http://files.fabianastro.com/uploads/1/3/1/1/131164440/ad644760b0e4f0b.pdf
    • http://files.escolaportuguesadepeabody.com/uploads/1/3/1/1/131164364/37d938a1d81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/84827114505.pdf
    • https://cdn.shopify.com/s/files/1/0432/4062/0200/files/diablo_2_median_xl_ultimative_uberquest_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9009/1940/files/bawubavejiliguxidovuzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4171/files/tewevosuzeriwejuje.pdf
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/zojapalivozavibuvus.pdf
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/86341102969.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/1598293811.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/65474737852.pdf
    • https://cdn.shopify.com/s/files/1/0440/6345/7432/files/formal_application_letter_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7271/files/tatobigatumurused.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/the_norton_anthology_of_short_fiction.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/84948393736.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_off00005c02.bin
bf2babc6e4a25ece57f0c96a23310edeb92f7acc1e21c3882df52e9ce198ceab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C02 5224 bytes
font_01_sfnt_off00006dd7.bin
ba83b35370a3da7d5a5c8391bad1481d55d823157e69df0f853629e2b98428f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD7 10680 bytes

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