Malicious PDF — malware analysis report

Static analysis result for SHA-256 44257b6c09ae38b1…

MALICIOUS

PDF

52.6 KB Created: 2020-08-06 12:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db0bab4dcfc706372e587a0fc66c48b7 SHA-1: 03fa726fe7b1cd45ebc1af972c9ddfbe3c7a20da SHA-256: 44257b6c09ae38b16eb5ed6c6051576d87a81d2c1e48977fcf24abb25d0055d3
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious link directing to a redirector. The document body mentions 'Asclepius wellness plan pdf', suggesting a lure for users interested in health or wellness information. The ML classifier strongly indicated maliciousness. The primary IOC is the redirector URL, which likely leads to a phishing or scam page.

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.cc/pify?keyword=asclepius+wellness+plan+pdf
    • http://files.anamarielewis.com/uploads/1/3/0/7/130776246/sebesoratom-piridi-nisibulujititud-jajefusivi.pdf
    • http://files.advancedmaterialsservices.com/uploads/1/3/0/7/130776230/nafumijaz.pdf
    • http://siwegi.exploresandiego.net/uploads/1/3/0/9/130969204/bevoginomadoze-vokarazoza-mazobu-lavazupanimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/11215592896.pdf
    • https://cdn.shopify.com/s/files/1/0432/2672/6568/files/alimentacion_y_nutricion_en_edad_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/88668812313.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4977/files/11430169483.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/public_provident_fund_scheme.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7055/files/zikinugib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19441108854.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/xezeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/zikonetinujigudar.pdf
    • https://cdn.shopify.com/s/files/1/0433/5848/6678/files/betetido.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006307.bin
255209a7f5fdacc46a5a22179b7612f4cc0f125dd03a69811e586f9128b92e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6307 4824 bytes
font_01_sfnt_off0000738b.bin
af6c60d5831659437fa49deef139fd38508f6d8b13cf4e09635a4f543a62d9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 15648 bytes
font_02_sfnt_off0000a354.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA354 4324 bytes
font_03_sfnt_off0000b154.bin
58559d41b733d93ace979f552c8ef047a612bc63e9e408fb038f1e21f0a5f1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 5552 bytes

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