Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a40130f8862566…

MALICIOUS

PDF

42.8 KB Created: 2020-08-14 07:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f79b85cad5078f17709c4cf3c131e7cf SHA-1: 0e0a4c6a5a191a72f3daa55f67b9d07f43a2ad13 SHA-256: 03a40130f8862566f544afa9ac71f48a47bdcfccab872763a9b191f52e3e86d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm and a redirector URL, indicating an attempt to lead users to malicious content. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key', a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful 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.com/pify?keyword=answer+key+of+ssc+je+civil+2019
    • http://files.kdwentertainment.com/uploads/1/3/1/8/131871424/zuwiduwivaroxog_lererisejut_kidat_meluvezu.pdf
    • http://fijedurep.apneaodyssey.com/uploads/1/3/1/4/131438641/1933430.pdf
    • http://files.arturofuentes.com/uploads/1/3/1/4/131407364/9834382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4130/0380/files/13426080058.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/jarotagozarisobenagavupo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/baruzixefelufovurolema.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/losofidafamef.pdf
    • https://cdn.shopify.com/s/files/1/0431/2426/1018/files/fosenuvinekagaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5864/files/schroeder_thermal_physics_solution.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/air_force_previous_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/farevazibafenigukezuzeso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6417/2445/files/poxulogejadebosopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0447/2127/5033/files/classroom_management_theories_and_models.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/business_project_proposal_sample_pdf_free_download.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_off0000677b.bin
d90f3b4a353a874990c0187ad04e346db2a74448637ae3e6dc27cf6db2e9f5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x677B 5532 bytes
font_01_sfnt_off00007a83.bin
e509b33b45727a865d47ff8ba3a876dd78d92b76674fd36b693a3866928672f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A83 10516 bytes

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