Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d4deeeda95fdd2…

MALICIOUS

PDF

47.8 KB Created: 2020-08-12 22:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c577217b7808652ed5b04fc78d4689 SHA-1: 97cc542fc9aebe3ac4561f58dd182094074190b7 SHA-256: 20d4deeeda95fdd2c7bd61d524f0e6973c372abf2e02638119ee2e9f2e280b45
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing a mass external PDF link farm, with many links pointing to shopify.com domains and one critical redirector link to ttraff.cc. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise the malicious nature of the links. The primary attack pattern involves leveraging these links, likely for SEO manipulation or to redirect users to malicious sites.

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.cc/pify?keyword=excipit+bel+ami+texte+pdf
    • http://fefodazo.meadowsoflaurelwood.com/uploads/1/3/2/7/132740720/virulivevinobedirix.pdf
    • http://files.jjhministries.com/uploads/1/3/0/7/130738484/pasepegopedira-gejanaweno-zobudiwej-direbof.pdf
    • http://files.byfieldschool.com/uploads/1/3/0/9/130968961/digafo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/howard_schechter_mammoth.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/cultivo_de_lombriz_roja_californiana.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/bordereau_de_remise_de_cheque_credit_agricole.pdf
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/db2_sql_error_code.pdf
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/angular_momentum_formula_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/xabexazev.pdf
    • https://cdn.shopify.com/s/files/1/0436/1843/5229/files/conceptual_physical_science_hewitt.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/appendectomy_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/84016995994.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/92955175821.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/gazowedofixo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3835/0231/files/arrival_of_the_queen_of_sheba_organ.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_off00007e33.bin
f1a6b859e4cf34c86180e6369594b7168a4b5b95a7c7a21abeca689e218b3307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E33 5192 bytes
font_01_sfnt_off00008fcd.bin
561c881dc49d067064a85dcc96efa6a2b20f6cbdcff63d452d2f0d98caf4aad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCD 10144 bytes

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