Malicious PDF — malware analysis report

Static analysis result for SHA-256 540279d9410f8df3…

MALICIOUS

PDF

127.4 KB Created: 2020-10-27 11:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5150825cd45f0bf3916617b58d671a2 SHA-1: 18b4af066ef0c392139ce3f5204e904c604aacfe SHA-256: 540279d9410f8df35e3d230c5011d07dafc087183b50b0716699eed22bf0fd9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to known malicious redirectors and a link farm, indicating an attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that aligns with the observed malicious link patterns.

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/123?keyword=arcadia+power+pdf
    • https://sesorefamasupuv.weebly.com/uploads/1/3/1/0/131071262/5964248.pdf
    • https://damuxuru.weebly.com/uploads/1/3/4/0/134040763/45503a70afd3a8.pdf
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/8319191.pdf
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5f8c6eaa63b4d.pdf
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5f9261c47f21e.pdf
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/1116b062e.pdf
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/7088324.pdf
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/kinuzopinapanej.pdf
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/2df6cdb8c.pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/c3603a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad97dc85-8421-4214-a259-02ad46d3014b/pedukobalowona.pdf
    • https://s3.amazonaws.com/subud/geometric_sequence_examples_with_solutions.pdf
    • https://s3.amazonaws.com/muxegeza/nusawawigugiminu.pdf
    • https://s3.amazonaws.com/mefadedosuw/41786757696.pdf
    • https://s3.amazonaws.com/sugaguxagu/j_j_benitez_caballo_de_troya_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/converter_curriculo_para_online.pdf
    • https://cdn.shopify.com/s/files/1/0500/6370/4255/files/gosupixada.pdf
    • https://cdn.shopify.com/s/files/1/0483/4312/2071/files/craftsman_10_band_saw_21400_manual.pdf
    • https://cdn.shopify.com/s/files/1/0485/6794/3328/files/vsam_file_status_39.pdf
    • https://cdn.shopify.com/s/files/1/0496/2667/7399/files/dd_rolling_stats_vs_point_buy.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_off0001b984.bin
72df9d65fc13556ac802365935693927006a61682a0d43d9cce3140e85d265fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B984 5020 bytes
font_01_sfnt_off0001cab4.bin
dc7bf835831e61f49bbe714f42c8a1838f0081b90880eef3c587c7d178afaebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAB4 11240 bytes

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