Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a8dc4ceb8291c7…

MALICIOUS

PDF

44.5 KB Created: 2020-08-23 02:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db779d521b84b3332bd8ad78c430ce3e SHA-1: 0f1b95d477aa23818e93b69366d7c7dc4711a8dc SHA-256: e7a8dc4ceb8291c71ca7ba1bcb5246c91be08a76dbcb907d71f92ba11050a70e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or redirection tactic to distribute malicious content. 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.ru/pify?keyword=prefixes+and+suffixes+list+pdf
    • http://files.kristyboisvert.com/uploads/1/3/0/7/130740196/955411.pdf
    • http://fexobuno.marissadanielledesign.com/uploads/1/3/1/3/131380651/bceef085f9d.pdf
    • http://gepej.yogadiversityinitiative.org/uploads/1/3/1/4/131437261/laroli_pezogijavamu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0328/files/xekimasulapijifepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/30408514713.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/acl_repair_rehab_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0433/6441/7694/files/dumejukalezazufomesojeji.pdf
    • https://cdn.shopify.com/s/files/1/0464/7691/8934/files/photolayers_superimpose_eraser_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/notivesegawopelonig.pdf
    • https://cdn.shopify.com/s/files/1/0431/0725/4439/files/tutegojigumitip.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/91266357466.pdf
    • https://cdn.shopify.com/s/files/1/0434/8012/1506/files/94908236516.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/theraband_exercises_for_shoulder_impingement.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/rewimusepil.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/22460990330.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8450/files/que_es_control_total_de_calidad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/sixipemigosibuxupi.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_off000068de.bin
6b137a563a28b0abbd57c56fddd284e7f19cabeca650ec274ba0caaf728fddf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DE 5104 bytes
font_01_sfnt_off00007a42.bin
74adc3b8198ac86d2f9eb95f9c8e28bab75c1905810191f0c7b3e067dcde67a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A42 13744 bytes

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