Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9095c1d7027b3ab…

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 23:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bedee040ae99b24df2c241802a38bca SHA-1: dcbed7dec422ecd8697ffd5a22744aadc9efe159 SHA-256: a9095c1d7027b3ab4a8e72ab25ccf9fc8961324ef1f9e602f49378d13640e1c4
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 what appears to be a link farm hosted on Shopify, with a primary redirector link to 'ttraff.ru'. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a deliberate attempt to obscure or distribute malicious links. The document body, though heavily obfuscated, contains the primary malicious URL.

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=couple+beach+wallpaper+free
    • http://files.makeupbyjennieg.com/uploads/1/3/0/7/130739542/085d15385a6e7ce.pdf
    • http://xidixig.sarahjebian.com/uploads/1/3/1/4/131453574/df267fe348.pdf
    • http://dekewolo.onecityhistoricalfoundation.com/uploads/1/3/0/8/130813108/tolebuli_bakimufazu_mudasa_bulodufixama.pdf
    • http://files.roanokeyoga.com/uploads/1/3/0/9/130969942/suxad.pdf
    • http://letew.stephenhallmarimba.com/uploads/1/3/0/8/130814687/rimomu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/17714065246.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/dakepelirum.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/alcoholicos_anonimos_libro_azul.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/wbpsc_assistant_engineer_electrical_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/6472161545.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/varorurekazab.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/collaboration_agreement_template_singapore.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/10554024360.pdf
    • https://cdn.shopify.com/s/files/1/0460/5791/4523/files/tofoxelujarasavoxixoka.pdf
    • https://cdn.shopify.com/s/files/1/0440/4733/5589/files/personal_loan_application_letter.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9907/files/nizorakunilob.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/16746034696.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/e_commerce_branding_strategies.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_off000065f2.bin
da3d17677eea8bf4e864883de7f43d90c8537088ed8dbbb231282c17f96b7937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F2 5064 bytes
font_01_sfnt_off00007733.bin
09ac2bc056176a9db8029d8652b5324e250a3b9a1597fbe2880aefdd5d66d97d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7733 9860 bytes

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