Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada86c5ffc5c70f8…

MALICIOUS

PDF

53.0 KB Created: 2020-08-15 06:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db014a43ea5b1e197f36bb830bd02cc1 SHA-1: 1624974962ea6a73bcf9991565bac44b827a251e SHA-256: ada86c5ffc5c70f8c752f15b20ec824fab1dda5be40f8889602b139ceb364d0a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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/wb?keyword=south%20south%20cooperation%20pdf
    • http://ribudel.kaimodeling.info/uploads/1/3/1/1/131163590/bamobademexa_zomavamozatofi_pemixoseror_kabisesitu.pdf
    • http://womis.chicagolandboxers.com/uploads/1/3/1/1/131163494/wanetawufigoxapafin.pdf
    • http://fatovasaz.brdge.org/uploads/1/3/2/8/132815002/gakurakepom-genuf.pdf
    • http://mubod.novafairytales.com/uploads/1/3/2/8/132814930/2871089.pdf
    • http://files.campmontestella.com/uploads/1/3/0/7/130775018/fadda851.pdf
    • https://cdn.shopify.com/s/files/1/0434/4558/4033/files/american_express_travel_insurance_policy.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/ninikebepalizad.pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/guia_pratico_de_analise_sintatica.pdf
    • https://cdn.shopify.com/s/files/1/0435/9703/7730/files/18648933840.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/resalemurajovuritefuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/arthritis_research_uk_back_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/88437567670.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/julofafapomabeke.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/70304660735.pdf
    • https://cdn.shopify.com/s/files/1/0434/2841/3607/files/86374799009.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/69945988226.pdf
    • https://cdn.shopify.com/s/files/1/0433/7896/6686/files/golang_delete_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/5167203413.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_off00009175.bin
c263ad25ea481d042b5193e08385c16f94c070471b1aa87850033f3463eb766f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9175 5316 bytes
font_01_sfnt_off0000a37e.bin
e1a765dcb432c330ab0e92d167eba01ebd19240c31fb7461d2685e8a1ec95da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA37E 10448 bytes

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