Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8cbd789a90fb08…

MALICIOUS

PDF

45.7 KB Created: 2020-08-24 10:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f82f11d2e9dbc57291d9bec69d6cb48 SHA-1: 7aabfd0929d92c3349b7798d24718928e74446a1 SHA-256: cf8cbd789a90fb0835ee09a2b9e9e3facce0e47aa1d468e72041507c1c8142a5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and references 'Brahma Kumaris daily murli tamil pdf', suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or redirection strategy. No scripts were extracted from this sample.

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.com/pify?keyword=brahma+kumaris+daily+murli+tamil+pdf
    • http://files.wagndog.com/uploads/1/3/0/7/130739529/kegubi.pdf
    • http://files.candcclaycreations.com/uploads/1/3/0/7/130776183/3099662.pdf
    • http://damuxiz.nigerianngo.com/uploads/1/3/2/7/132740328/jerinil_zisoxudewom.pdf
    • http://sofos.furahanaturalcare.com/uploads/1/3/0/7/130776728/lubem.pdf
    • http://rezama.cyclonejerseys.com/uploads/1/3/1/3/131380344/7871484.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/74230523640.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5137558887.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/83820389289.pdf
    • https://cdn.shopify.com/s/files/1/0436/4101/2374/files/47777352939.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/divotatuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/4825/6156/files/dizalasesokarini.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/pefanup.pdf
    • https://cdn.shopify.com/s/files/1/0457/7525/7756/files/multiplying_and_dividing_monomials_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4022/files/law_of_agency_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/microsoft_azure_iaas_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/xapebebedojovugus.pdf
    • https://cdn.shopify.com/s/files/1/0440/0827/6126/files/free_animated_template_for_microsoft_powerpoint_2010.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_off0000750f.bin
9fa2e42c6e69f0ed102cc8b6b722f63e7da030cf250166308cf4188062f10ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750F 5496 bytes
font_01_sfnt_off000087a5.bin
06b8631925293d66851a40e0c79e9cfa8863080b33da898dcc949c925a125337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A5 9976 bytes

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